AD-Tech ADT7110 Schematic [ru]
Infra-Red LED Driver IC for CCD Camera Module
General Description
ADT7110
The ADT7110 is a fixed frequency step-down
converter designed to drive Infrared LEDs in the
CCD camera module application.
And internal current limit circuit protect external
devices.
Features
• Input voltage range : 10.5V to 15V
• Current mode PWM controller with
integrated compensation components
• 350mA output load current available
• Built-in chip enable/disable function
• Built-in current limit protection
• 500kHz fixed frequency internal oscillator
• Small outline SOT-26 package (2.9mm x 1.6mm body)
6
4
5
A11
1
3
2
Package outline of the ADT7110
Applications
• Infrared LED driver for CCD camera
Typical Application Circuit
V
OUT
R
R
R
R
R
R
LED2
LED1
LED4
LED3
LED6
LED5
R
SE
RS
GND
VIN
A11
EN
VIN
C2
EN
R
FB2
R
FB1a
R
FB1b
R
FB1c
R
FB1d
R
FB1e
R
FB1f
L1
C1
U1
PWM
FB
V
FB
Mar. 12. 2009 / Rev. 0.1
* This specifications are subject to be changed without notice
1/4
http://www.ad-tech.co.kr
Infra-Red LED Driver IC for CCD Camera Module
Part List
Component Description Type Value
ADT7110
*1
U1
L1 Output filter inductor Chip inductor 47uH/590mA
C1 Output filter capacitor Tantalum capacitor 47uF/16V
C2 Bypass capacitor Tantalum capacitor 10uF/25V
R
SE
R
~ R
LED1
LED6
R
~ R
FB1a
FB1f
*3
R
FB2
*1 : For cost down , it is possible to use discrete component with a PNP transistor and a schottky barrier diode.
In this case, you make use the discrete components with proper electrical specification.
Table A shows the required key electrical limits. It is recommended to use PNP and schottky barrier diode
having equivalent specification in the Table A.
*2, *3 : To setting appropriate LED current, Refer to ‘Application Hints’.
Composite type with a PNP transistor
and schottky barrier diode
Current sense resistor Chip resistor 0.1Ω
*2
LED current ballast resistor Chip resistor , 1% 4.0Ω
Buck converter feedback loop
component
Buck converter feedback loop
component
IC FP103
Chip resistor 120㏀ (table 3)
Chip resistor , 1% 68㏀ (table 2)
Table A : Selection guide for the discrete components
Component Parameter Ratings Unit Remarks
PNP
Schottky
Barrier Diode
Collector to Emitter Voltage -23 V
Collector Current -2 A
Repetitive Peak Reverse Voltage 30 V
Average Rectified Current 700 mA
Package ; SOT-26, 2.9mm x 1.6mm body (units : mm)
Recommend
‘2SB1706’ by ROHM or Equivalent IC
Recommend
‘RSX101M-30’ by ROHM or Equivalent
Mar. 12. 2009 / Rev. 0.1
* This specifications are subject to be changed without notice
2/4
http://www.ad-tech.co.kr
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