UC3572N Datasheet

IC型號(hào)：
UC3572N
PDF描述：
IC-NEGATIVE OUTPUT PWM
文件大?。?/label>
254.82KB
PDF頁(yè)數(shù)：
4頁(yè)
芯片廠家：
ETC

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UC1572

UC2572

UC3572

Negative Output Flyback Pulse Width Modulator

FEATURES

鈥?/div>

Simple Single Inductor Flyback

PWM for Negative Voltage

Generation

Drives External PMOS Switch

Contains UVLO Circuit

Includes Pulse-by-Pulse Current

Limit

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

converter employing an external PMOS switch. The block diagram consists

of a precision reference, an error amplifier configured for voltage mode

operation, 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 activi-

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

sensed and limited to a user determined maximum value. The UVLO cir-

cuit 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 reduces the supply current to only 50碌A(chǔ), making the

UC3572 ideal for battery powered applications.

鈥?/div>

BLOCK DIAGRAM

UDG-94094-2

9/96

標(biāo)準(zhǔn)包裝
50
類(lèi)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(wú)
升壓
無(wú)
回掃
是
反相
是
倍增器
無(wú)
除法器
無(wú)
Cuk
無(wú)
隔離
無(wú)
工作溫度
0°C ~ 70°C
封裝/外殼
8-DIP（0.300"，7.62mm）
包裝
管件
其它名稱(chēng)
296-11224-5

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UC3572N Datasheet

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