LM25115 データシートの表示（PDF） - National ->Texas Instruments

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LM25115

Secondary Side Post Regulator Controller

National ->Texas Instruments 

Pin Descriptions (Continued)

Pin

Name

Description

Application Information

9

SYNC Synchronization input

A low impedance current input pin. The current into this pin sets

the RAMP capacitor charge current and the frequency of an

internal oscillator that provides a clock for the free-run (DC

input) mode .

10

PGND Power Ground

Connect directly to the analog ground pin (AGND).

11

LO

Low side gate driver output

Connect to the gate of the low side synchronous MOSFET

through a short, low inductance path.

12

VCC Output of bias regulator

Nominal 7V output from the internal LDO bias regulator. Locally

decouple to PGND using a low ESR/ESL capacitor located as

close to controller as possible.

13

HS

High side MOSFET source connection Connect to negative terminal of the bootstrap capacitor and the

source terminal of the high side MOSFET.

14

HO

High side gate driver output

Connect to the gate of high side MOSFET through a short, low

inductance path.

15

HB

High side gate driver bootstrap rail

Connect to the cathode of the bootstrap diode and the positive

terminal of the bootstrap capacitor. The bootstrap capacitor

supplies current to charge the high side MOSFET gate and

should be placed as close to controller as possible.

16

VBIAS Supply Bias Input

Input to the LDO bias regulator and current sense amplifier that

powers internal blocks. Input range of VBIAS is 4.5V to 30V.

- Exposed Pad Exposed Pad, underside of LLP package Internally bonded to the die substrate. Connect to system

(LLP

ground for low thermal impedance.

Package

Only)

3

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