SD4870CTR Silan Microelectronics, SD4870CTR Datasheet

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SD4870CTR

Manufacturer Part Number
SD4870CTR
Description
CURRENT MODE PWM CONTROLLER
Manufacturer
Silan Microelectronics
Datasheet
www.DataSheet4U.com
SD4870TR
SD4870A
SD4870C
SD4870CTR
ORDERING INFORMATION
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
CURRENT MODE PWM CONTROLLER
DESCRIPTION
SD4870 is a current mode PWM controller IC for high performance,
low standby power offline flyback converter application.
In no load or light load condition, the IC operates in Light Load
Mode to reduce switching loss and improve efficiency.
Large value startup resistor could be used in the startup circuit to
minimize the standby current because of low startup current.
SD4870 offers complete protection functions including cycle-by-
cycle over current protection, over load protection, V
voltage over voltage and under voltage protection, etc.
Excellent EMI performance is achieved with frequency shuffling
technique and soft switching control at the totem pole gate driver
output.
FEATURES
* Frequency shuffling to improve EMI performance
* Light Load Mode for minimum standby power
* External programmable switching frequency
* 3uA low startup current
* Internal LEB circuit
* VDD over voltage and under voltage protection
* Gate output maximum voltage clamp
* Over current protection
* Over load protection
* SOT-23-6L/SOP8/DIP8 package
Part No.
SOT-23-6L
DIP-8-300-2.54
SOP-8-225-1.27
SOP-8-225-1.27
Package
4870
SD4870A
SD4870C
SD4870C
Marking
DD
input
Pb free
Pb free
Pb free
Pb free
APPLICATIONS
* Battery Chargers
* Adapters
* Set-Top Box Power Supplies
DIP-8-300-2.54
Material
SOT-23-6L
REV:1.0
SOP-8-225-1.27
Packing Type
Tape & Reel
Tape & Reel
Tube
Tube
Page 1 of 8
2009.09.22

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SD4870CTR Summary of contents

Page 1

... Gate output maximum voltage clamp * Over current protection * Over load protection * SOT-23-6L/SOP8/DIP8 package www.DataSheet4U.com ORDERING INFORMATION Part No. SD4870TR SOT-23-6L SD4870A DIP-8-300-2.54 SD4870C SOP-8-225-1.27 SD4870CTR SOP-8-225-1.27 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn input DD Package Marking 4870 SD4870A SD4870C SD4870C SOT-23-6L DIP-8-300-2 ...

Page 2

... BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Characteristics VDD Voltage FB Voltage SENSE Voltage www.DataSheet4U.com RI Voltage Junction Temperature Lead Temperature Storage Temperature HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn Symbol V VDD SENSE stg Rating 25 -0.3~6 -0.3~6 -0.3~6 -20~150 260 -55~160 REV:1.0 2009.09.22 Page ...

Page 3

... Light Load Mode Frequency Frequency Shuffling Range Gate Driver Output Low Level Output High Level Output Clamp Voltage Level Output Rising Time Output Falling Time HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn (Unless otherwise specified, T Symbol Test Condition IV V =12 V,R =100kΩ DD_ST ...

Page 4

... The oscillation frequency is modulated with a random sourse so that the tone energe is spread out. The spead spectrum minmizes the conduction band EMI and the system design can be easier. The entire application system design can become simpler. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn Pin Name ...

Page 5

... When FB input voltage is higher than over load threshold voltage for more than T down and V voltage drops. IC restarts when V DD HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn is the value of external resistor and its unit is KΩ. drops below UVLO threshold voltage and IC enters power lower than UVLO threshold voltage ...

Page 6

... TYPICAL APPLICATION CIRCUIT www.DataSheet4U.com HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.0 2009.09.22 Page ...

Page 7

... PACKAGE OUTLINE DIP-8-300-2.54 SOP-8-225-1.27 www.DataSheet4U.com HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn UNIT: mm UNIT: mm REV:1.0 2009.09.22 Page ...

Page 8

... Silan products could cause loss of body injury or damage to property. • Silan will supply the best possible product for customers! HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn UNIT: mm REV:1.0 2009.09.22 ...

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