MT-7933 데이터 시트보기 (PDF) - Unspecified

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MT-7933

Single Stage, High PFC, AC-DC LED Driver

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Maximizing IC Performance

MT7933

Single Stage, High PFC, AC-DC LED Driver

DESCRIPTION

MT7933 is a single-stage，primary side control

AC-DC LED driver with active power factor

correction. MT7933 integrates on-chip PFC

circuit operates in critical conduction mode (CRM)

to achieve high power factor and reduce the

power MOSFET switching loss. With MAXIC

Proprietary control technique, precision LED

current is achieved without secondary side

sense and feedback circuit including

opto-coupler.

MT7933 provides various protections, such as

over current protection (OCP), over voltage

protection (OVP), short circuit protection (SCP)

and over temperature protection (OTP), etc, to

improve system reliability.

Typical Application Circuit

FEATURES

 Single-stage Active PFC for high power

factor and low THD

 Primary side control eliminates opto-coupler

 High precision LED current (+/-3%)

 Critical Conduction Mode operation

 Up to 60W driving capability.

 Cycle-by-cycle current limiting

 Under-voltage lockout (UVLO) protection

 VDD and output over voltage protection

 Adjustable constant current and output

power setting

 Power on soft-start

 Compact SOT23-6 package

APPLICATIONS

 AC/DC LED driver applications

 Signal and decorative LED lighting

 E27/PAR30/PAR38/GU10 etc.LED lamp

 T8/T10 LED String

C1

Vin_ac

MT7933

1

COMP

DSEN 6

C4

2

GND

5

VDD

3 CS

DRV 4

R6

C2

R5

D3

D1

R2 D2

C5

R3

T1

C3

R4

M2

NMOS

R1

VLED+

R10

VLED-

MT7933 Rev. 1.20

www.maxictech.com

Copyright © 2012 Maxic Technology Corporation

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