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MS1003SH 데이터시트 PDF




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부품번호 MS1003SH 기능
기능 Control IC
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MS1003SH 데이터시트, 핀배열, 회로
MS1003SHMS1004SH
Application Note Ver.2.2
The product and product specifications are subject to change without notice.
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SHINDENGEN ELECTRIC MFG. CO. , LTD




MS1003SH pdf, 반도체, 판매, 대치품
1. Overview
MS1003SHMS1004SH
Application Note Ver.2.2
1.1 Introduction
We have developed the MS1003SH and MS1004SH to meet the growing demand for power conservation.
These ICs incorporate a super standby mode to optimize power efficiency under micro loads.
The MS1003SH and MS1004SH consume less power in standby mode than conventional ICs. The ICs
incorporate various functions to make it more user-friendly and to make it easier to design a power supply
with fewer external components.
1.2 Characteristics
1) Quasi-resonant design for high efficiency and low noise
2) Four-step soft start function (40 ms/step)
3) Onboard startup circuit requires no startup resistor, dramatically reducing losses in the startup circuit.
4) The automatic trough skip function controls increases in oscillation frequency and improves efficiency
under light loads.
5) Auto burst function improves efficiency under light loads with no additional components.
6) Super standby mode improves efficiency under micro loads.
7) Soft drive circuit reduces noise.
8) Thermal shutdown, overvoltage protection, and overload protection (timer latch)
9) Primary current limit circuit incorporates an input voltage dependence correction circuit to reduce the
number of components required.
10) Bias assist function for startup circuit
11) Vcc-GND short circuit protection function
12) SOP-8 package employed for compact dimensions
1.3 Applications
Televisions, video recorders, refrigerators, washing machines, air conditioners and other appliances in
which reduced standby power consumption is a design goal.
1.4 Appearance and dimensions
Unit: mm
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MS1003SH 전자부품, 판매, 대치품
3. Circuit operation
3.1 Startup
The diagram below shows the startup sequence.
MS1003SHMS1004SH
Application Note Ver.2.2
Vin
Nc coil
backup
Off
Standby
Vcc(start)=
Vcc(stup off)=12V
Normal mode
Vcc(stop on normal)=9V
Vcc(stop normal)=8V
Vcc
On
VccUVLO
Startup
UVLO
Off On
Off On Off
On
Standby mode
Normal mode
Vcc(stup on stby)=8V
Vcc(stop stby)=12V
Startup sequence
3.1.1 Startup circuit
The startup circuit does not require a startup resistor,
making it possible to easily start the IC with a small
number of components. A schematic diagram of the
startup circuit is shown to the right.
Until the IC starts up, the startup circuit current Icc
(stup) flows from the Vin pin to the Vcc pin to charge
C, as shown in the diagram.
Startup circuit
Vin pin
Oscillation begins when the voltage at the Vcc pin
reaches Vcc (start). The startup circuit opens, and the
startup circuit current stops. The Vcc pin has hysteresis,
Vcc pin
which begins oscillating at Vcc (start) and stops
oscillating at Vcc (stop stby) or Vcc (stop normal). A
bias assist function is provided for the Vcc voltage to ensure safe startup. For more information on the bias
assist function, see Section 3.1.3.
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MS1003SH

Control IC

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