UC3846G-D08-T UTC [Unisonic Technologies], UC3846G-D08-T Datasheet

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UC3846G-D08-T

Manufacturer Part Number
UC3846G-D08-T
Description
LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
Manufacturer
UTC [Unisonic Technologies]
Datasheet
UC3846
LOW COST POWER-SAVING
MODE PWM CONTROLLER
FOR FLYBACK CONVERTERS
controller ideally suited for low standby power and cost effective
off-line flyback converter.
design and a large value resistor could be used in the startup
circuit to minimize the standby power. At no load condition, the
IC operates in burst mode for lower standby power and in
decreasing frequency for higher conversion efficiency at light
load condition. The PWM switching frequency is programmable
externally at normal operation.
automatic self-recovery including OCP (cycle-by-cycle current
limiting), OTP (over temperature protection), UVLO (V
voltage clamp and under voltage lockout).To protect the power
MOSFET, Gate-drive output is fixed up to 15V max.
high PWM duty cycle output. Leading-edge blanking on current
sense (CS) input removes the signal glitch that offers minimal
reqnirement of external component and lower system cost.
frequency hopping technique together with soft driver control.
Audio noise is eliminated because switch frequency is more
than 20kHz during operation.
battery charger, power adaptor, set-top box power supplies, ink
jet printers open-frame SMPS
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
The UTC UC3846 is a high performance current mode PWM
Low V
The UTC UC3846 contains protection coverage with
The internal slope compensation improves system stability at
Excellent EMI performance is achieved by UTC proprietary
The UTC UC3846 can be used in the applications, such as
DESCRIPTION
ORDERING INFORMATION
UC3846L-D08-T
UC3846L-D08-T
DD
Lead Free
startup current make the power reliable in startup
UNISONIC TECHNOLOGIES CO., LTD
Ordering Number
(3)Lead Free
(1)Packing Type
(2)Package Type
UC3846G-D08-T
Halogen Free
DD
(3) G: Halogen Free, L: Lead Free
(1) T: Tube
(2) D08: DIP-8
over
* UTC proprietary frequency hopping technology
* performance.
* Power-saving mode for high light-load efficiency
* Burst mode for minimum standby power
* Dynamic peak current limiting for constant output
* Built-in synchronized slope compensation
* OTP,OVP and V
* Programmable PWM Frequency
* Gate output voltage clamped at 15V
* Low start-up current
* Cycle-by-cycle Current Limiting
* Under voltage lockout (UVLO)
* Few external components required
for Improved EMI
power
LINEAR INTEGRATED CIRCUIT
FEATURES
Package
DIP-8
DD
clamp for higher security
Packing
Tube
DIP-8
QW-R103-053.B
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UC3846G-D08-T Summary of contents

Page 1

... Programmable PWM Frequency * Gate output voltage clamped at 15V * Low start-up current * Cycle-by-cycle Current Limiting * Under voltage lockout (UVLO) * Few external components required Package Halogen Free UC3846G-D08-T (1) T: Tube (2) D08: DIP-8 (3) G: Halogen Free, L: Lead Free DIP-8 clamp for higher security DD Packing ...

Page 2

UC3846 PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME PIN TYPE 1 GATE SENSE GND P UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw LINEAR ...

Page 3

UC3846 BLOCK DIAGRAM V DD 2/5 UVLO Reference voltage OVP Logic Control OTP FB 7/2 Slope Compensation 8/1 GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw LINEAR INTEGRATED CIRCUIT RI 5/3 Frequency Oscillator Hopping Latch S Burstmode R PWM COMP Constant Power ...

Page 4

UC3846 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Zener Clamp Zener Current Input Voltage to FB Pin Input Voltage to CS Pin Junction Temperature Operating Temperature Storage Temperature Note: Absolute maximum ratings are those values beyond which the device could be ...

Page 5

UC3846 OPERATION DESCRIPTION The UTC UC3846 devices integrate many useful designs into one controller for low-power switch-mode power supplies. The following descriptions highlight some of the features of the UTC UC3846 series. Start-up Current The start-up current is only 22μA. ...

Page 6

UC3846 OPERATION DESCRIPTION(Cont.) Frequency Hopping For EMI Improvement The Frequency hopping is implemented in the IC; there are two oscillators built-in the IC. The first oscillator is to set the normal switching frequency; the switching frequency is modulated with a ...

Page 7

UC3846 OPERATION DESCRIPTION(Cont.) Protection Controls The IC takes on more protection functions such as OVP and OTP etc. In case of those failure modes for continual blanking time, the driver is shut down. Driver is reset after failure is eliminated. ...

Page 8

UC3846 REFRENCE CIRCUIT BD1 CX1 GATE GND 7 2 VDD SENSE 4 R9 Reference BD1 CX1 (Optional) YC 472P/400V ...

Page 9

UC3846 TYPICAL CHARACTERISTICS Frequency in green mode (F OSC-green -40-25 - 95110 125 Temperature (℃) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw LINEAR INTEGRATED CIRCUIT ) vs Temperature ...

Page 10

UC3846 TYPICAL CHARACTERISTICS(Cont.) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and ...

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