LM5035AMHX-1 datasheet(4/30 Pages) NSC

部件名	LM5035AMHX-1

功能描述	PWM Controller with Integrated Half-Bridge and SyncFET PWM Controller with Integrated Half-Bridge and SyncFET

Download	30 Pages

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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4 / 30 page

Ordering Information

Order Number

Package Type

NSC Package Drawing

Supplied As

LM5035AMH

TSSOP-20EP

MXA20A

73 Units per Rail

LM5035AMHX

TSSOP-20EP

MXA20A

2500 Units on Tape and Reel

LM5035ASQ

LLP-24

SQA24B

1000 Units on Tape and Reel

LM5035ASQX

LLP-24

SQA24B

4500 Units on Tape and Reel

LM5035AMH-1

TSSOP-28EP

MXA28A

Rail of 48 Units

LM5035AMHX-1

TSSOP-28EP

MXA28A

2500 Units on Tape and Reel

Pin Descriptions for LM5035A and LM5035A–1

TSSOP 20 PIN

LM5035A

LLP PIN

LM5035A

TSSOP 28 PIN

LM5035A-1

Name

Description

Application Information

1

23

5

RAMP

Modulator ramp signal

An external RC circuit from VIN

sets the ramp slope. This pin is

discharged at the conclusion of

every cycle by an internal FET.

Discharge is initiated by either the

internal clock or the Volt • Second

clamp comparator.

2

24

6

UVLO

Line Under-Voltage

Lockout

An external voltage divider from the

power source sets the shutdown

and standby comparator levels.

When UVLO reaches the 0.4V

threshold the VCC and REF

regulators are enabled. When

UVLO reaches the 1.25V

threshold, the SS pin is released

and the device enters the active

mode. Hysteresis is set by an

internal current sink that pulls 23 µA

from the external resistor divider.

3

2

7

OVP

Line Over-Voltage

Protection

An external voltage divider from the

power source sets the shutdown

levels. The threshold is 1.25V.

Hysteresis is set by an internal

current source that sources 23µA

into the external resistor divider.

4

3

8

COMP

Input to the Pulse Width

Modulator

An external opto-coupler

connected to the COMP pin

sources current into an internal

NPN current mirror. The PWM duty

cycle is maximum with zero input

current, while 1mA reduces the

duty cycle to zero. The current

mirror improves the frequency

response by reducing the AC

voltage across the opto-coupler

detector.

www.national.com

4

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Texas Instruments	LM5035AMHX-1/NOPB	1Mb / 40P	[Old version datasheet] PWM Controller with Integrated Half-Bridge and SyncFET Drivers

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