TIL5942 Datasheet, PDF (2/19 Pages) Texas Instruments – CURRENT-MODE-PWM CONTROLLER WITH OPTOISOLATED VOLTAGE REFERENCE AND ERROR AMPLIFIER

TIL5942, TIL5942A
CURRENT-MODE-PWM CONTROLLER
WITH OPTOISOLATED VOLTAGE REFERENCE AND ERROR AMPLIFIER
SOES040 – OCTOBER 1997
functional block diagram
VCC ¹¹
PWM_GND ¹³
Voltage
Reference
Voltage
Regulator
10 _REG
REF ¹²
14
RT/CT
Oscillator
BIAS ⁴
3
COMP
FB ¹
2
INPUT_GND
Primary
Secondary
LED
TL1431X
I(VC)
IIB(IS)
1V
DQ
CLK
R
Driver
9
OUT
16 _IS
15
VC
TERMINAL
NAME
NO.
FB
1
INPUT_GND
2
COMP
3
BIAS
4
NC
7,8
OUT
9
REG
10
VCC
11
REF
12
PWM_GND
13
RT/CT
14
VC
15
IS
16
Terminal Functions
I/O
DESCRIPTION
I Feedback. FB is an error-amplifier inverting input.
I Ground connection for the voltage reference/error amplifier section.
O Error amplifier output/LED cathode connection. RC networks may be connected between COMP, FB, and
GND to stabilize the control loop of the dc/dc converter.
I Optocoupler LED anode. BIAS connects to the output voltage of the dc/dc converter or to some other suitable
supply voltage through a resistor.
No connection.
O Drive output. OUT is a pulse-width-modulated output.
O Regulator output. A 0.1-µF, typical, ceramic capacitor should be connected between REG and PWM_GND.
I Supply voltage for PWM controller
O PWM 5-V reference output
I PWM ground connection
Connection for external RC network to set PWM oscillator frequency
Connection for integrating capacitor (0.1µF typ) to PWM_GND (terminal 13)
I PWM current sense input
2
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265