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STR-A6100 Series
PRC, Auto Burst Standby, Current-Mode Control
Low Power Off-line SMPS Primary Switcher

Features
〔Pulse
● PRC Ratio Control〕: (8µs fixed off-time, variable on-time)
The switching frequency varies within an optimum range of 63kHz to 120kHz, according to load
variations, to create a quasi-jittering, low-EMI noise operation.
● Auto burst standby: (No Load Consumption < 100 mW at AC 264V)
Enables very low power consumption at no load.
Typical results of a 5W universal input power supply are 35mW at AC110V and 43mW at AC220V.
● Auto bias function
This function stabilizes operation during Auto Burst Standby mode, by preventing a Hiccup mode.
The Auto Bias function forces the IC to turn on before the VCC voltage reaches VCC (OFF) , thereby
stabilizing the entire power supply operation.
● Integrated startup circuit
Package (DIP-8)
600 V BCD process allows direct connection of the STARTUP pin to the rectified high voltage
rail. This reduces component count and improves overall efficiency. Outline (TOP VIEW)
● Current mode control
● Leading edge blanking Startup 5 4 VFB/OLP
Not required the external Low-pass filter circuit which prevent the malfunction due to the leading
3 GND
edge spike current.
● Avalanche energy guaranteed MOSFET with high VDSS 7
Drain 2 VCC
The built-in power MOSFET simplifies the surge absorption circuit since the MOSFET guarantees
the avalanche energy. Drain 8 1 S/OCP
No VDSS de-rating is required.
● Various protecting functions
• Over current protection ------------ pulse by pulse
• Over voltage protection ------------ with latch
• Overload protection ---------------- Auto restart
• Thermal shutdown ------------------ with latch

Applications
Battery Charger ---------------------- Cell Phone, Digital Still Camera, Camcorder, Shaver, Emergency light, Guidance light, and etc.
Standby Power Supply --------------- Various TV applications, PC, LBP, Audio system and etc.
S.M.P.S. -------------------------------- Ink jet printer, DVD Player/ Recorder, VCR, Set Top Box and etc.
Controller Power Supply ------------ Air conditioner, Refrigerator, Washer, Dish Washer and etc.

Product Lineup
Part Number VDSS RDS(ON) VIN(AC) Pout
STR-A6131 3.95Ω 100V/120V 12W
500V
STR-A6132 2.62Ω 100V/120V 16W
STR-A6153E 1.90Ω 230V/85V∼264V 24W/20W
STR-A6151 650V 3.95Ω 230V/85V∼264V 16W/12W
STR-A6159 6.00Ω 230V/85V∼264V 13W/10W
STR-A6169 800V 19.20Ω 230V/85V∼264V 8W/5W
STR-A6100 Series
■ Design example (STR-A6159) (5W Universal input-single output power supply)

F1 100kΩ SFPB-76 L2

D1 1000pF
L1 D11 ＋5V/1A
+ 630V R91
C1 C2 C91 PC1 R12
400V PC123 1.5kΩ
22µF 27kΩ
R11 50V R14
+ 0.1µF +
AC85∼264V C11 220Ω C12
D91 C13 10V
EG01C 10V
470µF 220µF
IC2
TL431 27kΩ
R15
8 7 5 EG01Z
D D Start up D2 GND
IC1
+
STR-A6159 C4
OCP VCC GND FB 35V
1 2 3 4 22µF
T1
4700pF EI-16
50V
RD5.1 D3 C3
R3
2.2Ω + PC1
C5 PC123
2200pF
50V 250V
2.2µF C99

■ Electrical Characteristics of the above power supply design

Efficiency η vs Output Current IO Input Power Pin vs Output Power PO

100 0.7
90 AC85V
0.6
80 AC110V
Input Power Pin (W)
Efficiency η(%)

70 0.5 AC220V
AC264V
60 0.4
AC85V
50 AC110V
40 0.3
AC220V
30 AC264V
0.2
20
0.1
10
0 0.0
0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.1 0.2 0.3 0.4
Output Current IO (A) Output Power PO (W)

CAUTION / WARNING
● Sanken reserves the right to make changes without further notice to any products herein in the interest of improvements in the performance, reliability, or
manufacturability of its products. Before placing order, Sanken advises its customers to obtain the latest version of the relevant information to verify that
the information being relied upon is current.
● Application and operation examples described in this document are supplementary and conditions and variation in additional parts are not considered.
When using the products herein, the applicability and suitability of such products for the intended purpose or object shall be reviewed at the users
responsibility.
● Application and operation examples described in this document are quoted for the sole purpose of reference for the use of the products herein and Sanken
can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of Sanken, or any third party
which may result from its use.
● Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a
certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the
equipment or systems against any possible injury, death, fires or damages to society die to device failure or malfunction.
● This publication shall not be reproduced in whole or in part without prior written approval form Sanken.

Tokyo Office 1-11-1 Nishi-Ikebukuro, Toshima-ku, Tokyo, JAPAN PHONE: +81-3-3986-6164 FAX: +81-3-3986-8637
Overseas Sales Offices
Asia Sanken Electric Singapore Pte. Ltd. PHONE: +65-291-4755 FAX: +65-297-1744
150 Beach Road, #14-03 The Gateway West, Singapore 0718
Sanken Electric Hong Kong Co., Ltd. PHONE: +852-2735-5262 FAX: +852-2735-5494
1018 Ocean Centre, Canton Road, Kowloon, Hong Kong
Sanken Electric Korea Co., Ltd. PHONE: +82-2-714-3700 FAX: +82-2-3272-2145
SK Life Bldg. 6F, 168 Kongduk-dong, Mapo-ku, Seoul, 121-705, Korea
North America Allegro MicroSystems,Inc. PHONE: (508)-853-5000 FAX: (508)-853-7861
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615, U.S.A.
Europe Allegro MicroSystems, Europe Limited. PHONE: 01932-253355 FAX: 01932-246622
Balfour House, Churchfield Road, Walton-on-Thames, Surrey KT12 2TD, U.K.

H2-I23EA0-0401010TA