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PDF BF1501 Data sheet ( Hoja de datos )
| Número de pieza | BF1501 | |
| Descripción | Off Line AC/DC Switch IC | |
| Fabricantes | BYD Microelectronics | |
| Logotipo |  |
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BYD Microelectronics Co., Ltd.
BF1501 Series
Off Line AC/DC Switcher IC
General Description
The THC0X 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, it regulates 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, over-voltage protection, current limited circuit,
leading edge blanking, over load protection and fault
condition auto-restart. They are ideal low power
AC/DC adapter/charger for cell phones.
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
z Low start-up current
Typ.15 µA
Max.25 µA
z Low operating current
Typ.2 mA
Max.5 mA
z UVLO(under voltage lockout)
Typ.12V start-up
Typ.6V shut-down
z LEB(leading edge blanking)
Typ.300ns
z OVP(over voltage protection)
Typ.28 V
z Operation Frequency
Typ.50KHZ
z Output Driver Ability
Typ.15 mA
z OLP(over load protection)
z Universal AC input range
z Constant voltage and constant
current
z Small SOT-23-6 Package
Typical Application Circuits
Notes
Datasheet
ES-BYD-WDZCE01D-045 Rev.A/0
Page 1 of 7
1 page  
BYD Microelectronics Co., Ltd.
BF1501 series
Test Circuits
(1) Normal operation current consumption
Test circuit 1
Close the S1, connect VSENSE with GND to ground and
make the OUT 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 VSENSE with GND to ground and
make the OUT pin floating.
Vx1 is the voltage V1 when the output (the OUT pin)
frequency changes from (0±1KHZ) to (25±10KHZ).
Vx2 is the voltage V1 when the output (the OUT pin)
frequency changes from (25±10KHZ) to (0±1KHZ).
Circuit1: For testing current consumption、CC/CV
mode transforming voltage、Hysteresis start-up
Circuit2: For testing Over current protection
detection voltage
(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 VSENSE with GND to ground and
make the OUT pin floating.
The CC/CV mode transforming voltage is the voltage V1
when the output (the OUT pin) frequency changes from
(50±10KHZ) to (0±1KHZ).
(4) Over current protection detection voltage
Test circuit 2
Set V1=15±0.03V, V2=0±0.03V, make the OUT pin floating.
The over current protection detection voltage is the voltage
V2 when the output (the OUT pin) frequency changes from
(35±10KHZ) to (0±1KHZ).
Datasheet
ES-BYD-WDZCE01D-045 Rev.A/0
Page 5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BF1501.PDF ] | |
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