NTE1729
Integrated Circuit
Pulse Width Modulator (PWM) Control Circuit
Description:
The NTE1729 is an inverter control unit in a 16Lead DIP type package which provides all the control
circuitry for PWM type switching regulators. Included in this device is the voltage reference, dual error
amplifiers, oscillator, pulse width modulator, pulse steering flip flop, dual alternating output switches,
and dead time control.
Features:
D
Complete PWM Power Control Circuit
D
Adjustable Dead Time: 0 to 100%
D
No Double Pulsing of Same Output during Load Transient Condition
D
Dual Error Amplifiers have Wide Common Mode Input Voltage Capability: 0.3V to V
CC
2V
D
Circuit Architecture Provides Easy Synchronization
D
Uncommitted Outputs for 250mA Sink or Source
D
With MissOperation Prevention Circuit for Low Level Supply Voltage
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Supply Voltage, V
CC
41V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Amplifier Input Voltage, V
ICM
V
CC
+0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage, V
CER
41V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Power Dissipation (T
A
= +25
C), P
T
1000mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
20
to +85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions:
Parameter
Symbol
Min
Typ
Max
Unit
Supply Voltage
V
CC
7
40
V
Output Voltage
V
CER
0.3
40
V
Output Current
I
C
200
mA
Error Amplifier Sink Current
I
OAMP
0.3
mA
Timing Capacitor
C
T
0.47
10000
nF
Timing Resistance
R
T
1.8
500
k
Oscillation Frequency
f
osc
1
300
kHz
Operating Temperature
T
opt
20
+70
C
Electrical Characteristics: (V
CC
= +15V, f = 10kHz, 20
T
A
+70
C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Reference Section
Output Voltage
V
ref
I
ref
= 1mA, T
A
= +25
C
4.75
5.0
5.25
V
Line Regulation
REG
IN
7V
V
CC
40V, I
ref
= 1mA,
T
A
= +25
C
8
25
mV
Load Regulation
REG
L
1mA
I
ref
10mA, T
A
= +25
C
1
15
mV
Temperature Coefficient
V
ref
20
T
A
+85
C, I
ref
= 1mA
0.01
0.03
%/
C
ShortCircuit Output Current
I
short
V
ref
= 0, T
A
= +25
C, Note 2
50
mA
Oscillator Section
Frequency
f
OSC
C
T
= 0.01
F, R
T
= 12k
, T
A
= +25
C
10
kHz
Standard Deviation of Frequency
7V
V
CC
40V, C
T
, R
T
, Const.,
T
A
= +25
C, Note 1
10
%
Frequency Change with Temperature
0
T
A
+70
C, C
T
= 0.01
F,
R
T
= 12k
1
2
%
Frequency Change with Voltage
7V
V
CC
40V, C
T
= 0.01
F,
R
T
= 12k
, T
A
= +25
C
1
%
DeadTime Control Section
Input Bias Current
0
V
I
5.25V
2
10
A
Maximum Duty Cycle (Each Output)
V
I
= 0
45
49
%
Input Threshold Voltage
V
th
Zero Duty Cycle
3.0
3.3
V
Maximum Duty Cycle
0
V
Error Amplifier Section
Input Offset Voltage
V
IO
V
OAMP
= 2.5V
2
10
mV
Input Offset Current
I
IO
V
OAMP
= 2.5V
25
250
nA
Input Bias Current
V
OAMP
= 2.5V
0.2
1.0
mA
Common Mode Input
Low
V
ICM
7V
V
CC
40V
0.3
V
Voltage
High
V
CC
2
V
OpenLoop Voltage Amplification
A
V
V
OAMP
= 0.5V to 3.5V, T
A
= +25
C
60
80
dB
Unity Gain Bandwidth
T
A
= +25
C
500
830
kHz
Common Mode Rejection Ratio
CMRR
V
CC
= 40V, T
A
= +25
C
65
80
dB
Output Sink Current
V
OAMP
= 0.7V
0.3
0.7
mA
Output Source Current
V
OAMP
= 3.5V
2
10
mA
PWM Section
Input Threshold Voltage
Zero Duty Cycle
4.0
4.5
V
Input Sink Current
V
(Pin3)
= 0.7V
0.3
0.7
mA
Output Section
Collector Cutoff Current
I
CER
V
CE
= 40V, V
CC
= 40V
2
100
A
Emitter Cutoff Current
V
CC
= V
C
= 40V
100
A
Collector Saturation Voltage
V
CE(sat)
I
C
= 200mA, V
E
= 0, Common Emitter
0
0.95
1.3
V
V
CE(on)
I
E
= 200mA, V
C
= 15V, Emitter Follower
1.6
2.5
V
Electrical Characteristics (Cont'd):
(V
CC
= +15V, f = 10kHz, 20
T
A
+70
C, unless otherwise
specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Output Section (Cont'd)
Output Voltage Rise
Time
Common
Emitter
t
r
V
CC
= 15V, R
L
= 150
,
I
O
= 100mA, T
A
= +25
C
100
200
ns
Emitter
Follower
O
A
100
200
ns
Output Voltage Fall
Time
Common
Emitter
t
f
70
200
ns
Emitter
Follower
70
200
ns
Total Device
Standby Current
I
CC(S.B.)
V
CC
= 15V, all other inputs and outputs
open
8.0
12.5
mA
Bias Current
I
CC(B.I.)
V
(Pin4)
= 2V
10
mA
Note 1. Standard deviation is a measure of the statistical distribution about the mean as derived from
the formula:
=
N
S
n = 1
(X
n
X)
2
N 1
Calculation expression of frequency is as follows:
f
OSC
=
0.817 R
T
D
C
T
+ 1.42
D
10
6
(Hz)
1
[R
T
] =
, [C
T
] = F
Note 2. Maximum duration of shortcircuit condition is 1sec (nonrepetitive).
Pin Connection Diagram
V
CC
R
T
C
T
1
2
3
4
NonInverting Input
Inverting Input
Feedback
DeadTime Control
5
6
7
GND
16
15
14
13
NonInverting Input
Inverting Input
Reference Output
Output Control
12
11
Collector 2
10
Emitter 2
8
Collector 1
9
Emitter 1
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