UC2572N Datasheet

IC型號(hào)：
UC2572N
PDF描述：
Voltage-Mode SMPS Controller
文件大小：
90.68KB
PDF頁數(shù)：
5頁
芯片廠家：
ETC

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UC1572

UC2572

UC3572

Negative Output Flyback Pulse Width Modulator

FEATURES

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Simple Single Inductor Flyback PWM

for Negative Voltage Generation

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Drives External PMOS Switch

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Contains UVLO Circuit

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Includes Pulse-by-Pulse Current Limit

鈥?/div>

Low 50碌A(chǔ) Sleep Mode Current

DESCRIPTION

The UC3572 is a negative output flyback pulse width modulator which con-

verts a positive input voltage to a regulated negative output voltage. The

chip is optimized for use in a single inductor negative flyback switching con-

verter employing an external PMOS switch. The block diagram consists of

a precision reference, an error amplifier configured for voltage mode opera-

tion, an oscillator, a PWM comparator with latching logic, and a 0.5A peak

gate driver. The UC3572 includes an undervoltage lockout circuit to insure

sufficient input supply voltage is present before any switching activity can

occur, and a pulse-by-pulse current limit. Output current can be sensed and

limited to a user determined maximum value. The UVLO circuit turns the

chip off when the input voltage is below the UVLO threshold. In addition, a

sleep comparator interfaces to the UVLO circuit to turn the chip off. This re-

duces the supply current to only 50碌A(chǔ), making the UC3572 ideal for battery

powered applications.

BLOCK DIAGRAM

UDG-94094-2

SLUS275A - MARCH 1999 - REVISED AUGUST 2001

標(biāo)準(zhǔn)包裝
50
類別
集成電路 (IC)
家庭
PMIC - 穩(wěn)壓器 - DC DC 切換控制器
系列
-
PWM 型
電壓模式
輸出數(shù)
1
頻率 - 最大
300kHz
占空比
100%
電源電壓
4.75 V ~ 30 V
降壓
無
升壓
無
回掃
是
反相
是
倍增器
無
除法器
無
Cuk
無
隔離
無
工作溫度
-40°C ~ 85°C
封裝/外殼
8-DIP（0.300"，7.62mm）
包裝
管件
其它名稱
296-11157-5

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UC2572N Datasheet

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