LM5035CMHSLASHNOPB datasheet(5/43 Pages) TI2

5 / 43 page

LM5035C

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SNVS631D – JANUARY 2010 – REVISED OCTOBER 2016

Product Folder Links: LM5035C

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Pin Functions (continued)

I/O

DESCRIPTION

APPLICATION INFORMATION

NAME

HTSSOP

WQFN

Current Sense input for

current limit

If CS exceeds 0.25 V the output pulse will be terminated,

entering cycle-by-cycle current limit. An internal switch

holds CS low for 50 ns after HO or LO switches high to

blank leading edge transients.

Soft-start Input

An internal 110-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 1.2 µA to increase the delay before retry.

DLY

Timing programming pin for

the LO and HO to SR1 and

SR2 outputs.

An external resistor to ground sets the timing for the non-

overlap time of HO to SR1 and LO to SR2.

RES

Restart Timer

If cycle-by-cycle current limit is exceeded during any

cycle, a 22-µA current is sourced to the RES pin

capacitor. If the RES capacitor voltage reaches 2.5 V, the

soft-start capacitor will be fully discharged and then

released with a pullup current of 1.2 µA. After the first

output pulse at LO (when SS > COMP offset, typically

1 V), the SS pin charging current will revert to 110 µA.

I/O

Boost voltage for the HO

driver

An external diode is required from VCC to HB and an

external capacitor is required from HS to HB to power the

HO gate driver.

I/O

Switch node

Connection common to the transformer and both power

switches. Provides a return path for the HO gate driver.

High-side gate drive output.

Output of the high-side PWM gate driver. Capable of

sinking 2-A peak current.

Low-side gate drive output.

Output of the low-side PWM gate driver. Capable of

sinking 2-A peak current.

PGND

GND

Power Ground

Connect directly to Analog Ground.

VCC

I/O

Output of the high-voltage

start-up regulator. The VCC

voltage is regulated to 7.6

If an auxiliary winding raises the voltage on this pin

above the regulation setpoint, the start-up regulator will

shut down, thus reducing the internal power dissipation.

SR2

Synchronous rectifier driver

output.

Control output of the synchronous FET gate. Capable of

0.5-A peak current.

SR1

Synchronous rectifier driver

output.

Control output of the synchronous FET gate. Capable of

0.5-A peak current.

REF

Output of 5-V Reference

Maximum output current is 20 mA. Locally decoupled

with a 0.1-µF capacitor.

VIN

Input voltage source

Input to the start-up regulator. Operating input range is

13 V to 100 V with transient capability to 105 V. For

power sources outside of this range, the LM5035C can

be biased directly at VCC by an external regulator.

GND

Exposed Pad, underside of

package

No electrical contact. Connect to system ground plane for

reduced thermal resistance.

—

No connection

No electrical contact.

—

No connection

No electrical contact.

—

No connection

No electrical contact.

—

No connection

No electrical contact.

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