AMS4155 데이터 시트보기 (PDF) - Advanced Monolithic Systems Inc

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AMS4155

2A OUTPUT PWM BUCK CONVERTER

Advanced Monolithic Systems Inc 

PIN DESCRIPTION

Pin Number

NAME

1

SYNC

2

BST

3

VIN

4

LX

5

GND

6

FB

7

COMP

8

ENABLE

AMS4155

DESCRIPTION

Synchronization Input. This pin is used to synchronize the internal oscillator frequency to

an external source. Leave SYNC unconnected or connect to GND if unused.

Bootstrap. This capacitor is needed to drive the power switch above the supply voltage. It

is connected between LX and BST pins to form a floating supply across the power switch

driver. The voltage across Cbst is about 5V and is supplied by the internal Vcc supply

when LX pin voltage is low.

Supply Voltage. The AMS4155 operates from a+4.75V to +23V unregulated input. Cin is

needed to prevent large voltage spikes from appearing at the input power supply.

This connects the inductor to the internal Switch

Ground Pin connected to PCB ground plane. This pin is also the ground for internal voltage

reference.

Feedback. A resistor network of two resistors is used to set-up the output voltage connected

between Output to GND. The node between the two resistors is connected to Feedback pin.

Compensation. This node is the output of the transconductance error amplifier and the

input to the current comparator. Frequency compensation is done at this node by

connecting a series R-C to ground.

Enable. A voltage greater than 2.495V at this pin enables device operation.

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

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