LM5032

SNVS344B – MARCH 2005 – REVISED DECEMBER 2014

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Pin Functions (continued)

PIN

I/O

DESCRIPTION

APPLICATIONS INFORMATION

NO.

NAME

12

SS2

I

Soft-start, Controller 2

An internal 50-µA current source charges an external capacitor to

set the soft-start rate. During a current limit restart sequence, the

internal current source is reduced to 1 µA to increase the delay

before retry. Forcing SS2 below 0.5 V shuts off Controller 2.

13

CS2

I

Current Sense Input, Controller 2

Input for current mode control and the current limit sensing. If the

CS2 pin exceeds 0.5 V the OUT2 pulse is terminated producing

cycle-by-cycle current limiting. External resistance connected to CS2

will adjust (increase) PWM slope compensation. This pin's voltage

must not exceed 1.25V.

14

COMP2

I

PWM Control, Controller 2

The COMP2 input provides voltage feedback to the PWM

comparator inverting input of Controller 2 through a 3:1 divider. The

OUT2 duty cycle increases as the COMP2 voltage increases. An

internal 5k

Ω pull-up resistor to 5.0 V provides bias current to the

opto-coupler transistor.

15

DCL

I

Duty Cycle Limit

An external resistor sets the maximum allowed duty cycle at OUT1

and OUT2.

16

RT/SYNC

I

Oscillator Adjust and Synchronizing

An external resistor sets the oscillator frequency. This pin also

input

accepts ac-coupled synchronization pulses from an external source.

6 Specifications

6.1 Absolute Maximum Ratings

(1) (2)

MIN

MAX

UNIT

VIN to GND

–0.3

105

V

VCC to GND

–0.3

16

V

RT/SYNC, RES and DCL to GND

–0.3

5.5

V

CS Pins to GND

–0.3

1.25

V

All other inputs to GND

–0.3

7

V

Junction temperature

150

°C

Lead Temperature (Soldering 4 sec),(3)

260

°C

Storage temperature, Tstg

–55

150

°C

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Recommended Operating Conditions are

conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the Electrical

Characteristics.

(2)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and

specifications.

(3)

For detailed information on soldering plastic TSSOP packages, refer to the Packaging Data Book available from Texas Instruments.

6.2 ESD Ratings

VALUE

UNIT

V(ESD)

Electrostatic discharge

Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)

±2000

V

(1)

JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

MAX

UNIT

VIN Voltage

13

100

V

External Voltage Applied to VCC

8

15

V

Operating Junction Temperature

–40

125

°C

4

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