Texas Instruments MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER TPS5103EVM-136 TPS5103EVM-136 Datenbogen

SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001

3

POST OFFICE BOX 655303 

•

 DALLAS, TEXAS 75265

COMP

8

I

Comparator input for voltage monitor

CT

4

I/O

External capacitor from CT to GND for adjusting the triangle oscillator and decreasing the current-limiting
voltage

FB

3

O

Feedback output of error amp

GND

6

Control GND

INV

2

I

Inverting input of both error amp and hysteretic comparator

LH

20

I/O

Bootstrap. Connect a 1 

µ

F, low-ESR capacitor from LH to LL.

LL

18

I/O

Bootstrap low. High-side gate driving return and output-current protection. Connect to the junction of the
high-side and low-side FETs for a floating drive configuration.

OUT_d

17

I/O

Gate-drive output for low-side power switching FETs

OUTGND

16

Ground for FET drivers

OUT_u

19

O

Gate-drive output for high-side power switching FETs

PWM/SKIP

9

I

PWM/SKIP mode select
L:PWM mode
H:SKIP mode

REF

7

O

1.185-V reference voltage output

RT

5

I/O

External resistor connection for adjusting the triangle oscillator.

SOFTSTART

1

I

External capacitor from SOFTSTART to GND for soft-start control

STBY

10

I

Standby control

TRIP

15

I

External resistor connection for output-current control

VCC

13

I

Supply-voltage input

VCC_SENSE

14

I

Supply voltage sense for current protection

VREF5

12

O

5-V internal regulator output

VREG5V_IN

11

I

External 5-V input (input voltage range = 4.5 V to 25 V)