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AN8038 Datasheet(PDF) 3 Page - Panasonic Semiconductor

Part # AN8038
Description  AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws
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Manufacturer  PANASONIC [Panasonic Semiconductor]
Direct Link  http://www.panasonic.com/industrial/
Logo PANASONIC - Panasonic Semiconductor

AN8038 Datasheet(HTML) 3 Page - Panasonic Semiconductor

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Voltage Regulators
AN8038, AN8038S
3
s Pin Descriptions
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
7VOUT
Output to drive a power MOSFET directly
8VCC
Power supply. This pin watches VCC , and has operating threshold voltages for the start, stop,
OVP, and OVP reset levels.
Parameter
Symbol
Range
Unit
Supply voltage
VCC
From the stop voltage to the OVP operating voltage
V
s Recommended Operating Range
Note) *1: When mounted on a printed circuit board: 477 mW
*2: When mounted on a printed circuit board: 191 mW
Parameter
Symbol
Rating
Unit
Supply voltage
VCC
28
V
Peak output current
IOP
−1, +2A
Power dissipation
AN8038
PD (Ta = 25°C)
500
mW
(Independent IC
PD (Ta = 85°C)
260
without a heat sink) AN8038S
PD (Ta = 25°C)
306 *
1
PD (Ta = 85°C)
122 *
2
Operating temperature
Topr
−30 to +85
°C
Storage temperature
Tstg
−55 to +150
°C
s Absolute Maximum Ratings


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