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Features: · Supports improved conformance with energy conservation laws by providing two operating modes.With external resistors, it is possible to set the operatingpoint at which the modes change over according to the load power, as shown below. 1.Continuous (RCC) modeHigh efficiency achieved w...

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AN8038S: Features: · Supports improved conformance with energy conservation laws by providing two operating modes.With external resistors, it is possible to set the operatingpoint at which the modes change ...

AN8038S Data Sheet

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Part Number:: AN8038S
Supply Ability:: 5000

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Product Details

Description

Features:

· Supports improved conformance with energy conservation laws by providing two operating modes. With external
    resistors, it is possible to set the operatingpoint at which the modes change over according to the load power, as shown
    below.
    1.Continuous (RCC) mode
    High efficiency achieved with local resonance operation(zero cross detection).
    2.Discontinuous mode(standby) modeReduced switching loss and standby power due to reduced frequency
· Input voltage correction function. This function correctsthe maximum on-period in a manner inversely proportionalto the
    input voltage.
· Built-in overvoltage protection function (detects at VCC pin)
· Pulse-by-pulse overcurrent protection function (single detection per one cycle)
· Packages: 8-pin DIP ··· AN8038
                     8-pin SOP ··· AN8038S

Specifications

· Supports improved conformance with energy conservation laws by providing two operating modes. With external
    resistors, it is possible to set the operatingpoint at which the modes change over according to the load power, as shown below.
    1.Continuous (RCC) mode
       High efficiency achieved with local resonance operation(zero cross detection).
     2.Discontinuous mode(standby) modeReduced switching loss and standby power due to reduced frequency
· Input voltage correction function. This function correctsthe maximum on-period in a manner inversely proportionalto the input voltage.
· Built-in overvoltage protection function (detects at VCC pin)
· Pulse-by-pulse overcurrent protection function (single detection per one cycle)
· Packages: 8-pin DIP ··· AN8038
                     8-pin SOP ··· AN8038S

Description

GND

Pin No.	Symbol	Description
1	TR	Transformer reset. When a transformer reset is detected, i.e., a low level is input to this pin, the IC output goes high. However, the transformer reset signal is ignored during the minimum off-period determined by the CF pin. The maximum on-period is also corrected according to the current flowing out of this pin.
2	RSTB	Adjusts the light-load detection level that determines the when the IC switches from RCC to discontinuous operation. When the voltage (VFB) which is I-V conversion of current feedback signal from IFB pin goes up higher than this pin, minimum off-period current at CF pin decreases, and operating frequency decreases. The detection level can be adjusted arbitrarily using an external pull-down resistor.
3	CF	Connection for the capacitor that determines the on and off periods for the IC output (Out).
4	IFB	Input for the current feedback signal from the power supply output photocoupler
5	CLM	Input of the pulse-by-pulse overcurrent protection circuit. Normally, it will be necessary to add an external filter for this input.
6	GND	Ground
7	VOUT	Output to drive a power MOSFET directly
8	VCC	Power supply. This pin watches VCC , and has operating threshold voltages for the start, stop, OVP, and OVP reset levels.

AN8038S

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