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RT8560 Datasheet(PDF) 5 Page - Richtek Technology Corporation

Part # RT8560
Description  High Voltage 4 Channel LED Driver
Download  15 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8560 Datasheet(HTML) 5 Page - Richtek Technology Corporation

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RT8560
5
DS8560-01 April 2011
www.richtek.com
Pin Number
Pin Name
Pin Function
1, 2, 3, 19, 20,
21 (Exposed Pad)
GND
Ground pin of the chip. The exposed pad must be soldered to a large PCB
and connected to GND for maximum power dissipation.
4, 5
SW
PWM boost converter switch node.
6
VCC2
Bipolar power switch base current supply. Typical beta of the power NPN
switch is approximately 70. VCC2 can be connected either to VCC1 or to a
separate lower voltage, as low as 3V, for better system efficiency and/or
heat concern. A good bypass is necessary.
7
VCC1
Power supply of the chip. For good bypass, a low ESR capacitor is required.
8
RISET
A resistor or a current from DAC on this pin programs the full LED current.
9
ACTL
Analog/Digital dimming control. When using analog dimming,
LED
ACT L
ISET
5.36k
I
= 20mA
for V
1.2V.
R
×≥
10
DCTL
By adding a 0.1uF filtering capacitor on ACTL pin, the PWM dimming signal
on DCTL pin will be averaged out and converted into analog dimming signal
on ACTL pin.
11
EN
Chip enable pin, when low chip is in shutdown mode.
12
OVP
Over voltage protection. PWM boost converter turns off when VOVP goes
higher than 2.5V.
13
SS
Soft start pin, a capacitor of at least 10nF is required for soft start.
14
VC
PWM boost converter loop compensation node.
18, 17, 16, 15
LED1, LED2,
LED3, LED4
Channel 1 to Channel 4 LED current sink. Leave the pin unconnected if not
used.
Functional Pin Description


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