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BYD Microelectronics

BF1501-DA Datasheet Preview

BF1501-DA Datasheet

Off Line AC/DC Switch IC

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BYD Microelectronics Co., Ltd.
BF1501-DA
Off Line AC/DC Switch IC
General Description
The BF1501-DA switcher ICs cost effectively
replace all power supplies up to 5W output power
based on unregulated isolated linear transformer
(50/60HZ). Unlike conventional PWM (pulse width
modulation) controllers, they regulate the output
voltage in a new method of off-time modulation
control. The controller consists of a VCO (voltage
control oscillator), Sense and logic circuit, VDD pin,
under-voltage lockout circuit, protection for
over-voltage, current limited circuit, leading edge
blanking, over load protection and fault condition
auto-restart. They are ideal low power AC/DC
adapter/charger solution for portable devices.
Applications
„ AC/DC adapter/charger for cell/cordless
phones, digital cameras, MP3/portable audio
devices etc
„ LED Lighting
„ Replacements for linear transformers and
RCC SMTPS
Features
„ Low start-up current
z Typ.15 µA
z Max.25 µA
„ Low operating current
z Typ.2 mA
z Max.5 mA
„ UVLO(under voltage lockout)
z Typ.12V start-up
z Typ.6V shut-down
„ LEB(leading edge blanking)
z Typ.300ns
„ OVP(over voltage protection)
z Typ.28 V
„ Operation Frequency
z Typ.50KHZ(VDD=21V)
„ Output Driver Ability
z Typ.15 mA
„ OLP(over load protection)
„ Universal AC input range
„ Constant voltage and constant current
„ Small SOT-23-6 Package
Typical application
Datasheet
TS-POM-PD-0003 Rev.A/1
Page 1 of 8




BYD Microelectronics

BF1501-DA Datasheet Preview

BF1501-DA Datasheet

Off Line AC/DC Switch IC

No Preview Available !

BYD Microelectronics Co., Ltd.
Block Diagram
VDD
12V
6V
0.5V
UVLO
OLP
Internal Ref
& Bias
OSC
GND
FB
1V
Package Type
BF1501-DA Sep-16-10
OVP
28V
S SET
R CLR
LEB
Driver
VOUT
OCP
0.5V
Sense
Pin Description
Pin number
1
2
3
4
5
6
Pin name
NC
GND
Sense
NC
Vout
VDD
Description
Not connected
Ground
Current sensor, it senses the voltage via a sensed resistor
Not connected
Gate drive output for the external power BJT switch
Power Supply
Datasheet
TS-POM-PD-0003 Rev.A/1
Page 2 of 8


Part Number BF1501-DA
Description Off Line AC/DC Switch IC
Maker BYD Microelectronics
Total Page 8 Pages
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