GL494
GL494
PWM CONTROL CIRCUIT
Description
The GL494 incorporates on a single monolithic chip all the
functions required in the construction of a pulse-width-
modulation control circuit. Designed primarily for power
supply control, the GL494 contains an on-chip 5-volt
regulator, two error amplifiers, adjustable oscillator, dead-
time control comparator, pulse-steering flip-flop, and
output-control circuitry. The uncommitted output
transistors pro-vide either common-emitter or emitter-
follower output capability. Push-pull or single-ended
output operation may be selected through the output-
control function. The ar-chitecture of the GL494 prohibits
the possibility of either output being pulsed twice during
push-pull operation.
Pin Configuration
NONINV INPUT
INV. INPUT
FEEDBACK
DEAD TIME CONTROL
Cr
Rr
GND
C1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NON INV INPUT
INV. INPUT
REF. OUT
OUTPUT CONTROL
Vcc
C2
E2
E1
Features
鈥?/div>
Complete PWM Power Control Circuitry
鈥?/div>
Uncommitted Outputs for 200mA Sink or Source
鈥?/div>
Output Control Selects Single-Ended or Push-Pull
Operation
鈥?/div>
Internal Circuitry Prohibits Double Pulse at Either
Output
鈥?/div>
Internal Regulator Provides a Stable 5V Reference
Supply
鈥?/div>
Variable Dead-Time Provides Control Over Total
Range
Function Table
Output Control
Grounded
At
V
ref
Output Function
Single-ended or Parallel Output
Normal Push-Pull Operation
Block Diagram
R
T
C
T
OSCILLATOR
OUTPUT
CONTROL
(See Function Table)
DEAD
TIME
CONTROL
0.1V
(4)
PULSE STEERING
FLIP FLOP
Q
T
Q
PWM
COMPARATOR
V
CC
(12)
REFERENCE
REGULATOR
(13)
ERROR AMPLIFIERS
NONINVERTING(1)
+
INPUT
INVERTING
INPUT
(2)
鈭?/div>
E1(9) C1(8)
ERROR AMP1
NONINVERTING(16)
INPUT
INVERTING
INPUT
FEEDBACK
(15)
(3)
+
鈭?/div>
ERROR AMP2
REF OUT
(14)
GND
(7)
E1(10) C2(11)
1
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