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PDF YB1682 Data sheet ( Hoja de datos )
| Número de pieza | YB1682 | |
| Descripción | 2A 380KHz 20V PWM Buck DC/DC Converter | |
| Fabricantes | YOBON TECHNOLOGIES | |
| Logotipo |  |
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YB1682
2A 380KHz 20V PWM Buck DC/DC Converter
Description
The YB1682 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
YB1682 serves as ideal power supply units
for portable devices.
Typical Application Circuit
Features
2A Constant Output Current
140mΩ RDSON Internal Power PMOSFET
Switch
Up to 92% Efficiency
Fixed 380KHz Frequency
Wide 3.6V to 20V Input Voltage Range
Output Adjustable from 1.222V to 18V
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
White LED Backlighting
Handheld PCs and PDAs
Mobile Phone
DSC and DV Flash Light Application
Pin Configuration
YB1682 Rev.1.0
Figure 1: Typical Application Circuit
www.yobon.com.tw
1
1 page  
Function Block
YB1682
2A 380KHz 20V 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 30µA.
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.
YB1682 Rev.1.0
www.yobon.com.tw
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet YB1682.PDF ] | |
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