Datasheet > AZ3844BM

AZ3844BM

更新时间： 2024-11-08 03:55:03

品牌	Logo	应用领域
美台 - DIODES		/
页数	文件大小	规格书
14页	189K
描述
Switching Regulator/Controller

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AZ3844BM 数据手册

Preliminary Datasheet

CURRENT MODE PWM CONTROLLER

AZ3842B/3B/4B/5B

General Description

Features

The AZ3842B/3B/4B/5B are high performance fixed

frequency current-mode PWM controller series. The

difference between AZ384XA and AZ384XB is that

they have different start-up currents.

Start-up Current: 0.30mA for AZ3842B/44B

0.20mA for AZ3843B/45B

Robust V

Line/Load Regulation

REF

Low Line Regulation : 4mV

Low Load Regulation : 4mV

High Stability of Reference Voltage over a Full

These integrated circuits are optimized for off-line and

DC-DC converter applications with minimum external

components. They feature under-voltage lockout

(UVLO) circuit with low start-up current, trimmed

oscillator for precise duty cycle control, current sense

comparator providing maximum current limiting and a

totem pole output stage for increasing output current.

In addition, these ICs also feature accurate protection

against over-temperature, over-current and maximal

output power.

Temperature Range: 0.2mV/ C

Operating Frequency up to 500KHz

High PWM Frequency Stability over a Full Tem-

perature Range: 2.5%

High PWM Frequency Stability under a Full Sup-

ply Voltage Range: 0.2%

Accurate Over-temperature Protection with Hys-

teresis

UVLO with Hysteresis

The AZ3842B and AZ3844B have UVLO thresholds

of 16V(on) and 10V(off); The corresponding thresh-

olds for AZ3843B and AZ3845B are 8.4 V(on) and

7.6V(off).

Applications

Off-line Converter

DC-DC Converter

Voltage Adapter

CRT Monitor Power Supply

Desktop Power Supply

DVD/STB Power Supply

The AZ3842B and AZ3843B can operate approaching

100% duty cycle; AZ3844B and AZ3845B can operate

from zero to 50% duty cycle.

These ICs are available in 3 packages: SOIC-8, DIP-8

and SOIC-14.

SOIC-14

SOIC-8

DIP-8

Figure 1. Package Types of AZ3842B/3B/4B/5B

BCD Semiconductor Manufacturing Limited

Apr. 2005 Rev. 1. 2

12 3 4 5 6 7...14

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