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PDF BF1501-DA Data sheet ( Hoja de datos )
| Número de pieza | BF1501-DA | |
| Descripción | Off Line AC/DC Switch IC | |
| Fabricantes | BYD Microelectronics | |
| Logotipo |  |
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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
1 page  
BYD Microelectronics Co., Ltd.
BF1501-DA Sep-16-10
Test Circuits
(1) Current consumption in start up period
(Test circuit 1)
Close the S1, connect Sense pin to ground and
make the VOUT pin floating.
Set V1=5±0.03V with 1ms delay time.
Keep V1 powered, increase V1 to 11±0.03V, the
current A1 flowing into VDD is the current
consumption.
(2) Hysteresis start-up (Test circuit 1)
When V1 increases over Vx1 (the first threshold
voltage) from 0V, the IC starts to work normally,
and only when V1 decreases under Vx2 (the
second threshold voltage), the IC stops working
and moves into standby mode.
Set V1=5±0.03V with 1ms delay time.
Close the S1, connect Sense pin to ground and
make the OUT pin floating.
Vx1 is the voltage V1 when the output (the VOUT
pin) frequency changes from (0±1KHZ) to
(30±10KHZ).
Vx2 is the voltage V1 when the output (the VOUT
pin) frequency changes from (30±10KHZ) to
(0±1KHZ).
(3) CC/CV mode transforming voltage
(Test circuit 1)
When the voltage increases to a certain value, IC
will change from CC mode to CV mode.
Set V1=5±0.03V with 1ms delay time.
Close the S1, connect Sense pin to ground and
make the VOUT pin floating.
The CC/CV mode transforming voltage is the
voltage V1 when the output (the VOUT pin)
frequency changes from (50±10KHZ) to less than
10KHZ.
(4) Over current protection detection voltage
(Test circuit 2)
Set V1=15±0.03V, V2=0±0.03V, make the VOUT
pin floating.
The over current protection detection voltage is
the voltage V2 when the output (the VOUT pin)
frequency changes from (35±10KHZ) to
(0±1KHZ).
A1
V1
S1
NC
GND
Sense
VDD
Vout
NC
Circuit1: For testing current consumption、
CC/CV mode transforming voltage、Hysteresis
start-up
Circuit2: For testing Over current
protection detection voltage
Datasheet
TS-POM-PD-0003 Rev.A/1
Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BF1501-DA.PDF ] | |
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