Datasheet > ML4828IS

ML4828IS

更新时间： 2024-01-10 18:52:50

品牌	Logo	应用领域
MICRO-LINEAR		开关光电二极管信息通信管理控制器
页数	文件大小	规格书
11页	190K
描述
BiCMOS Phase Modulation/Soft Switching Controller

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ML4828IS 数据手册

May 1997

ML4828*

BiCMOS Phase Modulation/Soft Switching Controller

GENERAL DESCRIPTION

FEATURES

The ML4828 is a complete BiCMOS phase modulation

control IC suitable for full bridge soft switching converters.

Unlike conventional PWM circuits, the phase modulation

technique allows for zero voltage switching (ZVS)

transitions and square wave drive across the transformer.

The IC modulates the phases of the two sides of the bridge

to control output power.

■ 5V BiCMOS for low power and high frequency

(1MHz) operation

■ Full bridge phase modulation zero voltage switching

circuit with independent programmable delay times

■ Current or voltage mode operation capability

■ Cycle-by-cycle current limiting with integrating fault

detection and restart delay

The ML4828 can be operated in either voltage or current

mode. Both cycle-by-cycle current limit, integrating fault

detection, and soft start reset are provided. The under-

voltage lockout circuit features a 1.5V hysteresis with a

low starting current to allow off-line start up with a bleed

resistor. A shutdown function powers down the IC, putting

it into a low quiescent state.

■ Can be externally synchronized

■ Four 3Ω CMOS output drivers

■ Under-voltage lockout circuit with 1.5V hysteresis

The circuit can be operated at frequencies up to 1MHz.

The ML4828 contains four high current CMOS outputs

which feature high slew rate with low cross conduction.

*Some Packages Are End Of Life

BLOCK DIAGRAM

REF

SYNC R

2.5V REF

OSC

SDN

UVLO

DRIVER

ERROR

AMP

EA+

EA–

–

DELAY A

ISS

ΦMOD

–

EAO

16 A2

DRIVER

RAMP

2.5V

1.25V

–

DELAY B

FAULT

LOGIC

RST 12

DRIVER

13 B2

IRST

LIM

–

LIM

GND

12 3 4 5 6 7...11

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