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PDF ( 数据手册 , 数据表 ) WS3215

零件编号 WS3215
描述 Step-down High Brightness LED Driver
制造商 WINSEMI
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WS3215 数据手册, 描述, 功能
WS3215
40V/1.5A Step-down High Brightness LED Driver
Features
■ Simple low parts count
■ Wide input voltage range8V to 40V
■ Up to 1.5A output current
■ Output current limit protection
■ Over temperature protection
■ Single pin on/off and brightness control using DC
Voltage or PWM
■ Typical 5% output current accuracy
■ Inherent open-circuit LED protection
■ High efficiency (up to 97% )
■ Adjustable LED constant current
Applications
■ MR16 LEDs
■ Automotive lighting
■ Low Voltage industrial lighting
■ illuminated signs
Typical Application Circuit
Description
The WS3215 is a continuous conduction mode inductive
step-down converter.designed for driving single or
multiple series LED efficiently from a voltage source
higher than the total LED chain voltage. The device
operates from an input supply between 8V and 30V and
provides an external adjustable output current of up to
1.5A.Depending upon supply voltage and external
components, the WS3215 can provide more than 10 watts
of output power. The WS3215 includes the power switch
and a high-side output current sensing circuit .which uses
an external resistor to set the nominal average output
current, and a dedicated DIM input accepts either a DC
voltage or a wide range of pulsed dimming. Applying a
voltage of 0.3V or lower to the DIM pin turns the output off
and switches the device into a low current standby state.
WS3215 using SOT89-5 package .
Rev.1.0 July.2011
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.







WS3215 pdf, 数据表
WS3215
Operation Description
Applying WS3215 with inductor (L) and current sensing
resistance RSforms a self-oscillating step-down continuous
current mode inductive LED controller. When Vin increases at
the beginning, LED output current are zero initially through
inductor, sensing resistance. Meanwhile, the CS comparator
turns high, the voltage of SW is low and the internal power
MOSFET is conductible. Through the external components
and internal power MOSFET to GND, output current gets
greater with a constant rate determined by the voltage
difference between inductor’s two terminals, then generate a
sensing voltage on the RS. If (Vin-Vcsn)>110mV, CS
comparator turns low and internal power MOSFET turn off, the
state can not change until (Vin-Vcsn)<90mV. As a result, the
Average LED output current can be caculated by the following
equation:
Iout
=
0.09 + 0.11
2 × Rs
=
0.1
Rs
High-side current sensing circuit is applied for less
external components. With 1% accuracy of sensing
resistance, the LED output current can be controlled
within 5% variation. A dedicated DIM input accepts a wide
range of a DC voltage or pulsed dimming. Applying a
voltage of 2.5V or higher to the DIM pin will turn on the
power MOSFET completely, however, 0.3V or lower will
turn the output off. Therefore, it is available to receive a
PWM dimming frequency range from 100Hz to 20KHz.
Otherwise, an external resistance can be used to set the
LED output current. Linking with the internal pull-up
resistance (typically 1.2 Mohm) , which is connected to the
inner regulated 5V, a voltage applied to the DIM can be
achieved. By changing the ratio between the outer and
inner resistance, the dimming voltage can be different and
brightness of LED can be adjustable.
During the turn-off phase, the quiescent current is only
60uA although the inner reference module is still at work..
For the consideration of reliability, over-temperature
protection in WS3215 is necessary. It avoids the WS3215
suffering over-temperature damage and guarantees the
maximum LED output current after recovery to normal.
Steady, keep you advance
8/9














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