SD4870A SILAN [Silan Microelectronics Joint-stock], SD4870A Datasheet

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SD4870A

Manufacturer Part Number
SD4870A
Description
CURRENT MODE PWM CONTROLLER
Manufacturer
SILAN [Silan Microelectronics Joint-stock]
Datasheet
1.SD4870A.pdf (8 pages)
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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SD4870A Summary of contents

Page 1

... HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn input DD DIP-8-300-2.54 APPLICATIONS * Battery Chargers * Adapters * Set-Top Box Power Supplies Marking Material 4870 Pb free SD4870A Pb free SD4870C Pb free SD4870C Pb free SOT-23-6L SOP-8-225-1.27 Packing Type Tape & Reel Tube Tube Tape & Reel REV:1.0 2009 ...

Page 2

BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Characteristics Symbol VDD Voltage V FB Voltage SENSE Voltage V RI Voltage Junction Temperature Lead Temperature Storage Temperature HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn VDD V FB SENSE stg ...

Page 3

ELECTRICAL CHARACTERISTICS Characteristics Symbol V DD Startup Current IV Operation Current UVLO Threshold Voltage UVLO Hysteresis Voltage V V Clamp Voltage VV DD Feedback PWM Gain FB Open Loop Voltage VF FB Short Circuit Current I FB_SHORT FB OL Threshold ...

Page 4

... PIN CONFIGURATION PIN DESCRIPTIONS Pin No. Pin Name SD4870A SD4870 SD4870C 3,6 FUNCTION DESCRIPTIONS SD4870 is a current mode PWM controller used in applications for offline flyback converter. The description of functions is as follows. Startup Control Startup current of SD4870 is very low so that IC could start up quickly. A large value startup resistor can be used in startup circuit to minimize standby power loss yet provides reliable startup in application MΩ ...

Page 5

Light Load Mode In no load or light load condition, major power loss of total power consumption is from switching loss on the MOSFET transistor switching loss, the core loss of the transformer loss and the loss on the external ...

Page 6

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

Page 8

PACKAGE OUTLINE SOT-23-6L MOS DEVICES OPERATE NOTES: Electrostatic charges may exist in many things. Please take following preventive measures to prevent effectively the MOS electric circuit as a result of the damage which is caused by discharge: The operator must ...

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