NTE7096 & NTE7097
Integrated Circuit
Current Mode Pulse Width Modulator (PWM)
Control Circuit
Description:
The NTE7096 and NTE7097 are integrated circuits in 8Lead DIP type packages that incorporate a
new precision temperaturecontrolled oscillator with an internally trimmed discharge current to mini-
mize variations in frequency. A precision dutycycle clamp eliminates any need for an external oscil-
lator when at, or near, a 50% dutycycle condition. Dutycycles greater than 50% are also possible.
Special logic ensures that V
ref
is stabilized before the output stage is enabled. Ionimplant resistors
provide tighter control of undervoltage lockout.
Other features include low startup current, pulsebycurrent limiting, and highcurrent totem pole
output for driving capacitive loads, such as the gate of a power MOSFET. The output is low in the
off state, consistent with Nchannel devices.
Features:
D
Optimized for OffLine Control
D
Internally Trimmed Temperature Compensated Oscillator
D
Maximum DutyCycle Clamp
D
V
ref
Stabilized before Output Stage is Enabled
D
Low StartUp Current
D
Pulseby Pulse Current Limiting
D
Improved U/V Lockout
D
Double Pulse Suppression
D
1% Trimmed Bandgap Reference
D
High Current Totem Pole Output
Absolute Maximum Ratings:
Supply Voltage (I
CC
< 30mA)
Self Limiting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Voltage (Low Impedence Source)
30V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Current
1A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Energy (Capacitive Load)
5
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Inputs (Pin2, Pin3)
0.3V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Amp Output Sink Current
10mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parameter
Test Conditions
Min
Typ
Max
Unit
UnderVoltage Lockout Section
Start Threshold
NTE7096
14.5
16.0
17.5
V
NTE7097
7.8
8.4
9.0
V
Minimum Operating Voltage
NTE7096
After Turn On
8.5
10.0
11.5
V
NTE7097
7.0
7.9
8.2
V
Note 1. Adjust V
CC
above the start threshold before setting at 15V.
Note 2. These parameters, although guaranteed, are not 100% tested in production.
Note 3. Parameter measured at trip point of latch with V
PIN2
= 0.
Note 4. Gain defined as:
A =
V
PIN1
V
PIN3
; 0
V
PIN3
0.8V
V
CC
V
REF
R
T
C
T
I
SENSE
V
FB
Pin Connection Diagram
1
2
3
4
COMP
8
7
6
5
OUTPUT
GND
1
4
.260 (6.6)
.390 (9.9)
Max
8
5
.155
(3.93)
.145 (3.68)
.300 (7.62)
.300 (7.62)
.100 (2.54)