TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
Copyright
1995, Texas Instruments Incorporated
4–1
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
•
Complete PWM Power Control Circuitry
•
Completely Synchronized Operation
•
Internal Undervoltage Lockout Protection
•
Wide Supply Voltage Range
•
Internal Short-Circuit Protection
•
Oscillator Frequency . . . 500 kHz Max
•
Variable Dead Time Provides Control Over
Total Range
•
Internal Regulator Provides a Stable 2.5-V
Reference Supply
description
The TL1451AC incorporates on a single monolithic chip all the functions required in the construction of two
pulse-width-modulation (PWM) control circuits. Designed primarily for power supply control, the TL1451AC
contains an on-chip 2.5-V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators,
undervoltage lockout circuitry, and dual common-emitter output transistor circuits.
The uncommitted output transistors provide common-emitter output capability for each controller. The internal
amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time control (DTC)
comparator has no offset unless externally altered and can provide 0% to 100% dead time. The on-chip oscillator
can be operated by terminating RT and CT. During low V
CC
conditions, the undervoltage lockout control circuit
feature locks the outputs off until the internal circuitry is operational.
The TL1451AC is characterized for operation from – 20
°
C to 85
°
C.
AVAILABLE OPTIONS
T
PACKAGED DEVICES
CHIP FORM
TA
SMALL OUTLINE
(DB)†
PLASTIC DIP
(N)
SMALL OUTLINE
(NS)
TSSOP
(PW)†
CHIP FORM
(Y)
– 20
°
C to 85
°
C
TL1451ACDB
TL1451ACN
TL1451ACNS
TL1451ACPW
TL1451AY
† The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE).
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CT
RT
ERROR 1IN +
AMPLIFIER 1 1IN –
1FEEDBACK
1DTC
1OUT
GND
REF
SCP
2IN + ERROR
2IN – AMPLIFIER 2
2FEEDBACK
2DTC
2OUT
V
CC
DB, N, NS, OR PW PACKAGE
(TOP VIEW)
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
functional block diagram
+
–
+
–
Oscillator
Reference
Voltage
1/2 Vref
R
S
170 k
Ω
UVLO
R
9
2
1
VCC RT
CT
10
16
7
8
REF
GND
PWM
COMP
PWM
COMP
12 k
Ω
11
14
13
12
5
15
3
4
6
2 DTC
IN +
IN –
2 FEEDBACK
1 FEEDBACK
SCP
IN +
IN –
1 DTC
ERROR
AMPLIFIER 2
ERROR
AMPLIFIER 1
1 OUTPUT
2 OUTPUT
COMPONENT COUNT
Resistors
65
Capacitors
8
Transistors
105
JFETs
18
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–3
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TL1451AY chip information
This chip, when properly assembled, displays characteristics similar to the TL1451AC. Thermal compression
or ultrasonic bonding may be used on the doped aluminum bonding pads. The chip may be mounted with
conductive epoxy or a gold-silicon preform.
BONDING PAD ASSIGNMENTS
CHIP THICKNESS:
15 MILS TYPICAL
BONDING PADS:
4
×
4 MILS MINIMUM
TJmax = 150
°
C
TOLERANCES
ARE
±
10%.
ALL DIMENSIONS
ARE IN MILS.
89
75
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
TL1451Y
(2)
(14)
(1)
(3)
(4)
(5)
(6)
(7)
(8)
(16)
(13)
(12)
(11)
(10)
(9)
REF
2IN+
2IN –
2FEEDBACK
2DTC
2OUT
VCC
GND
1DTC
1FEEDBACK
1IN –
RT
CT
1OUT
(15)
SCP
1IN+
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range
†
Supply voltage, V
CC
51 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier input voltage, V
I
20 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output voltage, V
O
51 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output current, I
O
21 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power total dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
– 20
°
C to 85
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
– 65
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATING TABLE
PACKAGE
TA
≤
25
°
C
POWER RATING
DERATING FACTOR
ABOVE TA = 25
°
C
TA = 70
°
C
POWER RATING
TA = 85
°
C
POWER RATING
DB
775 mW
6.2 mW/
°
C
496 mW
403 mW
N
1000 mW
8.0 mW/
°
C
640 mW
520 mW
NS
500 mW
4.0 mW/
°
C
320 mW
260 mW
PW
700 mW
5.6 mW/
°
C
448 mW
364 mW
recommended operating conditions
MIN
MAX
UNIT
Supply voltage, VCC
3.6
50
V
Amplifier input voltage, VI
1.05
1.45
V
Collector output voltage, VO
50
V
Collector output current, IO
20
mA
Current into feedback terminal
45
µ
A
Feedback resistor, RF
100
k
Ω
Timing capacitor, CT
150
15000
pF
Timing resistor, RT
5.1
100
k
Ω
Oscillator frequency
1
500
kHz
Operating free-air temperature, TA
– 20
85
°
C
electrical characteristics over recommended operating free-air temperature range, V
CC
= 6 V,
f = 200 kHz (unless otherwise noted)
reference section
PARAMETER
TEST CONDITIONS
TL1451AC
TL1451Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Output voltage (pin 16)
IO = 1 mA
2.4
2.5
2.6
2.5
V
Output voltage change with temperature
TA = –20
°
C to 25
°
C
– 0.1%
±
1%
– 0.1%
Output voltage change with temperature
TA = 25
°
C to 85
°
C
– 0.2%
±
1%
– 0.2%
Input voltage regulation
VCC = 3.6 V to 40 V
2
12.5
2
mV
Output voltage regulation
IO = 0.1 mA to 1 mA
1
7.5
1
mV
Short-circuit output current
VO = 0
3
10
30
10
mA
† All typical values are at TA = 25
°
C.
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–5
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
undervoltage lockout section
PARAMETER
TEST CONDITIONS
TL1451AC, TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
UNIT
Upper threshold voltage (VCC)
I
0 1
A
T
25
°
C
2.72
V
Lower threshold voltage (VCC)
IO(ref) = 0 1 mA
TA = 25
°
C
2.6
V
Hysteresis (VCC)
IO(ref) = 0.1 mA,
TA = 25
°
C
80
120
mV
Reset threshold voltage (VCC)
1.5
1.9
V
† All typical values are at TA = 25
°
C.
short-circuit protection control section
PARAMETER
TEST CONDITIONS
TL1451AC
TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Input threshold voltage (SCP)
TA = 25
°
C
0.65
0.7
0.75
0.65
0.7
0.75
V
Standby voltage (SCP)
No pullup
140
185
230
185
mV
Latched input voltage (SCP)
No pullup
60
120
60
mV
Input (source) current
VI = 0.7 V,
TA = 25
°
C
–10
–15
–20
–10
–15
–20
µ
A
Comparator threshold voltage (FEEDBACK)
1.18
1.18
V
† All typical values are at TA = 25
°
C.
oscillator section
PARAMETER
TEST CONDITIONS
TL1451C
TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Frequency
CT = 330 pF,
RT = 10 k
Ω
200
200
kHz
Standard deviation of frequency
CT = 330 pF,
RT = 10 k
Ω
10%
10%
Frequency change with voltage
VCC = 3.6 V to 40 V
1%
1%
Frequency change with temperature
TA = –20
°
C to 25
°
C
– 0.4%
±
2%
– 0.4%
Frequency change with temperature
TA = 25
°
C to 85
°
C
– 0.2%
±
2%
– 0.2%
† All typical values are at TA = 25
°
C.
dead-time control section
PARAMETER
TEST CONDITIONS
TL1451AC
TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Input bias current (DTC)
1
µ
A
Latch mode (source) current (DTC)
TA = 25
°
C
– 80
–145
– 80
–145
µ
A
Latched input voltage (DTC)
IO = 40
µ
A
2.3
V
Input threshold voltage at f = 10 kHz (DTC)
Zero duty cycle
2.05
2.25
2.05
V
Input threshold voltage at f = 10 kHz (DTC)
Maximum duty cycle
1.2
1.45
1.45
V
† All typical values are at TA = 25
°
C.
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–6
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
error-amplifier section
PARAMETER
TEST CONDITIONS
TL1451AC
TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Input offset voltage
VO (FEEDBACK) = 1.25 V
±
6
mV
Input offset current
VO (FEEDBACK) = 1.25 V
±
100
nA
Input bias current
VO (FEEDBACK) = 1.25 V
160
500
160
nA
C
d i
l
V
3 6 V
40 V
1.05
V
Common-mode input voltage range
VCC = 3.6 V to 40 V
1.05
to
V
p
g
g
CC
1.45
Open-loop voltage amplification
RF = 200 k
Ω
70
80
80
dB
Unity-gain bandwidth
1.5
1.5
MHz
Common-mode rejection ratio
60
80
80
dB
Positive output voltage swing
Vref – 0.1
V
Negative output voltage swing
1
V
Output (sink) current (FEEDBACK)
VID = – 0.1 V,
VO = 1.25 V
0.5
1.6
1.6
mA
Output (source) current (FEEDBACK)
VID = 0.1 V,
VO = 1.25 V
– 45
–70
–70
µ
A
† All typical values are at TA = 25
°
C.
output section
PARAMETER
TEST CONDITIONS
TL1451AC
TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Collector off-state current
VO = 50 V
10
µ
A
Output saturation voltage
IO = 10 mA
1.2
2
1.2
V
Short-circuit output current
VO = 6 V
90
90
mA
† All typical values are at TA = 25
°
C.
pwm comparator section
PARAMETER
TEST CONDITIONS
TL1451AC
TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Input threshold voltage at f = 10 kHz (FEEDBACK)
Zero duty cycle
2.05
2.25
2.05
V
Input threshold voltage at f = 10 kHz (FEEDBACK)
Maximum duty cycle
1.2
1.45
1.45
V
† All typical values are at TA = 25
°
C.
total device
PARAMETER
TEST CONDITIONS
TL1451AC
TL1451AY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
Standby supply current
Off-state
1.3
1.8
1.3
mA
Average supply current
RT = 10 k
Ω
1.7
2.4
1.7
mA
† All typical values are at TA = 25
°
C.
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–7
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
8
7
6
5
4
3
2
1
9
10
11
12
13
14
15
16
S1
CPE
0.47
µ
F
Test
Input
VCC = 5 V
RL
4.7 k
Ω
4.7 k
Ω
RL
OUT1
OUT2
CT
330 pF
RT
10 k
Ω
Test
Input
TL1551AC
Figure 1. Test Circuit
Dead Time 100%
tpe†
2.0 V
1.6 V
1.4 V
1.25 V
H
L
H
L
0.6 V
0 V
H
L
3.6 V
0 V
Oscillator Triangle Waveform
Error Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
Output Transistor Collector
Waveform
Protection Enable
Terminal Waveform
Short-Circuit Protection
Comparator Output
Power Supply Voltage
† Protection Enable Time, tpe = (0.051 x 106 x Cpe) in seconds
2.8 V TYP
Figure 2. TL1451AC Timing Diagram
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–8
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
100 k
10 k
1 k
1 M
1 k
4 k
10 k
40 k
100 k
400 k
1 M
TRIANGLE OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
CT = 150 pF
CT = 1500 pF
CT = 15000 pF
VCC = 5 V
TA = 25
°
C
RT – Timing Resistance –
Ω
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
0
–1
–2
–3
–25
0
25
50
afosc – Oscillator Frequency V
ariation – %
1
2
OSCILLATOR FREQUENCY VARIATION
vs
FREE-AIR TEMPERATURE
3
75
100
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
VCC = 3.6 V
RT = 10 k
Ω
CT = 330 pF
fosc = 200 kHz
TA – Free-Air Temperature –
°
C
osc
f
∆
fosc – T
riangle Oscillator Frequency – Hz
osc
f
Figure 3
Figure 4
2.2
2
1.6
1.4
0.8
2.6
1.8
T
riangle W
aveform Swing V
oltage – V
2.4
TRIANGLE WAVEFORM SWING VOLTAGE
vs
TIMING CAPACITANCE
1.2
1
VCC = 5 V
RT = 5.1 k
Ω
TA = 25
°
C
CT – Timing Capacitance – pF
101
102
103
104
105
T
riangle W
aveform Period – uS
TRIANGLE WAVEFORM PERIOD
vs
TIMING CAPACITANCE
VCC = 5 V
RT = 5.1 k
Ω
TA = 25
°
C
s
µ
102
101
100
10–1
101
102
103
104
105
CT – Timing Capacitance – pF
Figure 5
Figure 6
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–9
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
0
–10
– 20
– 30
– 25
0
25
50
10
20
REFERENCE OUTPUT VOLTAGE VARIATION
vs
FREE-AIR TEMPERATURE
30
75
100
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
VCC = 3.6 V
II(ref) = 1 mA
TA – Free-Air Temperature –
°
C
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
0
–10
– 20
– 30
– 25
0
25
50
10
20
REFERENCE OUTPUT VOLTAGE VARIATION
vs
FREE-AIR TEMPERATURE
30
75
100
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
VCC = 40 V
II(ref) = 1 mA
TA – Free-Air Temperature –
°
C
avref – Reference Output V
oltage V
ariation – mV
ÁÁ
ÁÁ
ÁÁ
ÁÁ
V
O(ref)
∆
avref – Reference Output V
oltage V
ariation – mV
ÁÁ
ÁÁ
ÁÁ
ÁÁ
V
O(ref)
∆
Figure 7
Figure 8
1.5
1
0.5
0
0
5
10
15
20
25
2
2.5
REFERENCE OUTPUT VOLTAGE
vs
SUPPLY VOLTAGE
3
30
35
40
TA = 25
°
C
VCC – Supply Voltage – V
0.8
0.7
0.6
– 25
0
25
50
Dropout V
oltage V
ariation – V
0.9
1
DROPOUT VOLTAGE VARIATION
vs
FREE-TEMPERATURE
1.1
75
100
TA – Free-Air Temperature –
°
C
II(ref) = 1 mA
V
ref – Reference Output V
oltage – V
ÁÁ
ÁÁ
ÁÁ
ÁÁ
V
O(ref)
Figure 9
Figure 10
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–10
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
3
2
1
0
0
1
2
3
VCE – Output Collector V
oltage – V
4
5
UNDERVOLTAGE LOCKOUT
HYSTERESIS CHARACTERISTICS
6
4
5
TA = 25
°
C
TA = –20
°
C
IO = 10 mA
7,10
8
RL
5 V
I = IO
VDE
TA = 85
°
C
VCC – Supply Voltage – V
ÁÁ
ÁÁ
ÁÁ
V
CE
2
–25
0
25
50
Undervoltage Lockout Threshold V
oltage
–
V
2.5
3
UNDERVOLTAGE LOCKOUT CHARACTERISTIC
3.5
75
100
Threshold Voltage –VTH
(Left Scale)
Threshold Voltage –VTL
(Left Scale)
Hysteresis Voltage
(Right Scale)
300
200
100
0
Undervoltage Lockout Hystersis V
oltage
–
mV
TA – Free-Air Temperature –
°
C
3.25
2.75
2.25
50
150
250
Figure 11
Figure 12
1.20
1.15
1.10
– 25
0
25
Comparator Threshold V
oltage
–
V
1.25
1.30
SHORT-CIRCUIT PROTECTION CHARACTERISTICS
50
75
100
Short-Circuit Protection
Latch Reset Supply Voltage
(Right Scale)
Short-Circuit Protection
Comparator Threshold Voltage
(Left Scale)
3
2.5
2
1.5
1
RS – Latch Reset Supply V
oltage – V
TA – Free-Air Temperature –
°
C
Figure 13
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–11
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
9
6
3
0
0
50
100
150
tpe – Protection Enable T
ime – s
12
15
PROTECTION ENABLE TIME
vs
PROTECTION ENABLE CAPACITANCE
18
200
250
t pe
CPE – Protection Enable Capacitance –
µ
F
+
–
Protection
Latch
S
R
CPE
U.V.L.O.
ERROR AMP 1
ERROR AMP 2
1.25 V
Short-circuit
Protection
Comparator
12 k
Ω
15
16
SCP
Vref
170 k
Ω
Vref
Vref
Figure 14
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–12
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
1.75
1.5
1
0.75
0
2.25
1.25
1 k
10 k
100 k
1 M
10 M
Error
Amp Maximum Output V
oltage Swing – V
2
f – Frequency – Hz
ERROR AMP MAXIMUM OUTPUT VOLTAGE SWING
vs
FREQUENCY
0.5
0.25
VCC = 5 V
TA = 25
°
C
70
60
40
30
0
90
50
100
1 k
10 k
100 k
1 M 2 M
Open-Loop V
oltage
Amplification – dB
80
f – Frequency – Hz
OPEN-LOOP VOLTAGE AMPLIFICATION
vs
FREQUENCY
20
10
VCC = 5 V
TA = 25
°
C
Figure 15
Figure 16
–5
–20
1 k
10 k
100 k
G – Gain – dB
f – Frequency – Hz
GAIN (AMPLIFIER IN
UNITY-GAIN CONFIGURATION)
vs
FREQUENCY
10
1 M
10 M
5
0
–10
–15
VCC = 5 V
TA = 25
°
C
Figure 17
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–13
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 150
Ω
Cref = 470 pF
TA = 25
°
C
50
30
20
0
70
40
100
1 k
10 k
100 k
1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0
°
– 10
°
– 20
°
– 30
°
– 40
°
– 50
°
– 60
°
– 70
°
– 80
°
– 90
°
Phase Shift
Cx
Rref
Cref
Vref
39 k
Ω
39 k
Ω
+
–
Test Circuit
Figure 18
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–14
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 15
Ω
Cref = 470 pF
TA = 25
°
C
50
30
20
0
70
40
100
1 k
10 k
100 k
1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0
°
– 10
°
– 20
°
– 30
°
– 40
°
– 50
°
– 60
°
– 70
°
– 80
°
– 90
°
Phase Shift
Cx
Rref
Cref
Vref
39 k
Ω
39 k
Ω
+
–
Test Circuit
Figure 19
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–15
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 15
Ω
Cref = 470 pF
TA = 25
°
C
50
30
20
0
70
40
100
1 k
10 k
100 k
1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0
°
– 10
°
– 20
°
– 30
°
– 40
°
– 50
°
– 60
°
– 70
°
– 80
°
– 90
°
Phase Shift
Cx
Rref
Cref
Vref
39 k
Ω
39 k
Ω
+
–
Test Circuit
Figure 20
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–16
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Cref = 470 pF
TA = 25
°
C
50
30
20
0
70
40
100
1 k
10 k
100 k
1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0
°
– 10
°
– 20
°
– 30
°
– 40
°
– 50
°
– 60
°
– 70
°
– 80
°
– 90
°
Phase Shift
Cref
Vref
39 k
Ω
39 k
Ω
+
–
Test Circuit
Figure 21
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–17
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
60
40
20
0
0
5
10
Output Sink Current – mA
80
100
Collector Output Saturation Voltage – V
OUTPUT SINK CURRENT
vs
COLLECTOR OUTPUT SATURATION VOLTAGE
120
15
20
110
90
70
50
30
10
TA = – 20
°
C
TA = 25
°
C
VCC = 3.6 V
TA = 85
°
C
Figure 22
MAXIMUM OUTPUT VOLTAGE SWING
vs
FREE-AIR TEMPERATURE
VO(ref) – 0.01
VO(ref) – 0.02
VO(ref) – 0.03
VO(ref) – 0.04
VO(ref) – 0.05
VO(ref) – 0.06
VO(ref) – 0.07
1
0.9
0.8
0.7
0.6
0.5
– 25
0
25
50
75
100
TA – Free-Air Temperature –
°
C
Maximum Output Voltage
Swing (Right Scale)
Maximum Output
Voltage Swing (Right Scale)
+
–
RL
100 k
Ω
Vvom – 1
33 k
Ω
33 k
Ω
VCC = 3.6 V
RL = 100 k
Ω
VOM+1 = 1.25 V
VOM –1 = 1.15 V (Right Scale)
VOM –1 = 1.35 V (Left Scale)
Vref
TEST CIRCUIT
– Maximum Output V
oltage Swing – V
V
OM
– Maximum Output V
oltage Swing – V
V
OM
Figure 23
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–18
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
50
60
90
100
0
0.5
1
1.5
2
2.5
3
Output T
ransistor “On” Duty Cycle – %
30
10
Dead-Time Input Voltage – V
OUTPUT TRANSISTOR “ON” DUTY CYCLE
vs
DEAD-TIME INPUT VOLTAGE
0
3.5
4
70
20
40
80
VCC = 3.6 V
RT = 10k
Ω
CT = 330 pF
1
0.5
0
0
10
20
ICC (Standby) – Standby Current – mA
2
STANDBY CURRENT
vs
SUPPLY VOLTAGE
30
40
1.5
ÁÁ
ÁÁ
CCI
VCC – Supply Voltage – V
TA = 25
°
C
1.75
1.25
0.75
0.25
Figure 24
Figure 25
1
0.5
0
–25
0
25
50
ICC – Supply Current – mA
1.5
2
STANDBY CURRENT
vs
FREE-AIR TEMPERATURE
75
100
ÁÁ
ÁÁ
CCI
TA – Free-Air Temperature –
°
C
Average Supply Current
VCC = 6 V, RT = 10 k
Ω
,
CT = 330 pF
Stand-By Current, VCC = 40 V, No Load
Stand-By Current, VCC = 3.6 V, No Load
600
400
200
0
–25
0
25
50
Maximum Continuous Power Dissipation – mW
800
1000
MAXIMUM CONTINUOUS POWER DISSIPATION
vs
FREE-AIR TEMPERATURE
1200
75
100
1100
900
700
500
300
100
16-Pin N Plastic Dip
16-Pin NS Plastic SO
Thermal Resistance
125
°
C/W
Thermal Resistance
250
°
C/W
TA – Free-Air Temperature
1.75
1.25
0.75
0.25
Figure 26
Figure 27
TL1451AC, TL1451AY
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024C – FEBRUARY 1983 – REVISED OCTOBER 1995
4–19
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
APPLICATION INFORMATION
R7
R6
C4
470
Ω
1
µ
F
220
Ω
C2
R4
R3
33 k
Ω
33 k
Ω
470
Ω
150
Ω
220 k
Ω
0.47
µ
F
50 k
Ω
R1
500 pF
pF
C5
R5
500
C1
8
7
6
5
4
3
2
1
9
10
11
12
13
14
15
16
330 pF
L1
R2
33 k
Ω
33 k
Ω
Vref
33 k
Ω
33 k
Ω
470
Ω
470
Ω
L2
VCC
Step-Up
Output
Step-Down
Output
TL1451AC
NOTE A. Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application.
Figure 28. High-Speed Dual Switching Regulator
4–20
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor
product or service without notice, and advises its customers to obtain the latest version of relevant information
to verify, before placing orders, that the information being relied on is current.
TI warrants performance of its semiconductor products and related software to the specifications applicable at
the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are
utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each
device is not necessarily performed, except those mandated by government requirements.
Certain applications using semiconductor products may involve potential risks of death, personal injury, or
severe property or environmental damage (“Critical Applications”).
TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED
TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS.
Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI
products in such applications requires the written approval of an appropriate TI officer. Questions concerning
potential risk applications should be directed to TI through a local SC sales office.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards should be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein. Nor does TI warrant or represent that any license, either
express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property
right of TI covering or relating to any combination, machine, or process in which such semiconductor products
or services might be or are used.
Copyright
1995, Texas Instruments Incorporated
Wyszukiwarka
Podobne podstrony:
BenQ Q7T4 FP71G NCP1200 TL1451
więcej podobnych podstron