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PDF YB1685 Data sheet ( Hoja de datos )

Número de pieza YB1685
Descripción 2A 380KHz 32V PWM Buck DC/DC Converter
Fabricantes YOBON TECHNOLOGIES 
Logotipo YOBON TECHNOLOGIES Logotipo



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YB1685
2A 380KHz 32V PWM Buck DC/DC Converter
Description
The YB1685 is a 380 KHz fixed frequency
monolithic step down switch mode
regulator with a built in internal Power
MOSFET. It achieves 2A continuous output
current over a wide input supply range with
excellent load and line regulation. The
device includes a voltage reference,
oscillation circuit, error amplifier, internal
PMOS and etc.
The PWM control circuit is able to adjust
the duty ratio linearly from 0 to 100%. An
enable function, an over current protection
function and a short circuit protection
function are built inside. An internal
compensation block is built in to minimize
external component count.
The YB1685 serves as ideal power supply
units for portable devices.
Features
„ 2A Constant Output Current
„ 140mRDSON Internal Power PMOSFET
Switch
„ Up to 92% Efficiency Fixed 380KHz
Frequency
„ Wide 3.6V to 32V Input Voltage Range
„ Output Adjustable from 1.235V to 30V
„ Output Current Protection
„ Built in Frequency Compensation
„ Built in Thermal Shutdown Function
„ Built in Current Limit Function
„ SOP8 Package is Available
„ The Minimum Dropout up to 0.3V
„ Pb-free Package
Applications
„ Portable DVD
„ LCD Monitor / TV
„ Battery Charger
„ ADSL Modem
„ Telecom / Networking Equipment
Typical Application Circuit
YB1685 Rev.1.0
Figure 1: Typical Application Circuit
www.yobon.com.tw
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YB1685 pdf
Function Block
YB1685
2A 380KHz 32V PWM Buck DC/DC Converter
Figure 3: Function Block
Functional Description
VIN
This is the positive input supply for the IC
switching regulator. A suitable input bypass
capacitor must be present at this pin to
minimize voltage transients and to supply
the switching currents needed by the
regulator.
Gnd
Circuit ground.
SW
Internal switch. The voltage at this pin
switches between (VIN – VGS) and
approximately – 0.5V, with a duty cycle of
approximately VOUT / VIN. To minimize
coupling to sensitive circuitry, the PC board
copper area connected to this pin should
be kept a minimum.
FB
Senses the regulated output voltage to
complete the feedback loop.
EN
Allows the switching regulator circuit to be
shutdown using logic level signals thus
dropping the total input supply current to
approximately 3 µA.
Pulling this pin below a threshold voltage of
approximately 0.7V turns the regulator
down, and pulling this pin above 1.3V (up to
a maximum of 12V) shuts the regulator on.
For automatic star up condition, can be
implemented by the addition of a resistive
voltage divider from VIN to GND.
YB1685 Rev.1.0
www.yobon.com.tw
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