amc7140 ADD Microtech Inc., amc7140 Datasheet - Page 5

• Manufacturer Part Number: amc7140
• Description: 700ma High Voltage Adjustable Current Regulator With Enable Control
• Manufacturer: ADD Microtech Inc.

The current could be linearly adjusted through variable resister connected to I
Although the absolute maximum rating of OUT pin 60V, the dropout voltage between OUT pin and GND pin should
not be too large when current is sinking because of the heat dissipation capability of the package.
DC Voltage Input:
AMC7140 as long as V
If 50V ~ 60V voltage level is adopted as power source to positive end of the LED string, one Zener shunt regulator
could be used to provide appropriate voltage to VDD pin.
Copyright © 2008 ADDtek Corp.
Enable
AMC7140 is a high voltage, low dropout current regulator for maximum output current up to 700mA with OE pin.
Here are some of the typical application examples:
Any DC voltage level between 5V to 50V could be adopted as power source V
＜50V
C
IN
DC
R
R
SET
SET
2
1
DD
880Ω
is larger than the total forward voltage drop of the LED string (at expecting current) by 0.35V.
VDD
OE
ISET
AMC7140
GND
APPLICATION INFORMATION
OUT
5
Enable
＞50V
C
IN
DC
D
SET
R
Z
Z
pin, or by PWM control via OE pin.
R
R
SET
SET
2
1
DD
880Ω
DD032_D -- AUGUST 2008
for typical application of
VDD
OE
ISET
AMC7140
AMC7140
GND
OUT