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LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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41/140
The AAT3192 is a charge-pump based, current-sink white LED driver capable of driving one or two LEDs
up to 30mA, each. It automatically switches between 1x mode and 2x mode to maintain the highest
efficiency and optimal LED current accuracy and matching. The AAT3192 charge pump’s 1x mode
(bypass mode) has very low resistance allowing LED current regulation to be maintained with input
supply voltage approaching the LED forward voltage. The AAT3192 is available in the 2x2mm, 10-lead
SC70JW-10 package.
• Drives up to 2 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 2x Modes
• 0.9MHz Switching Frequency
• Linear LED Output Current Control
̲
Single-wire, S2Cwire Interface
• AAT3192-1: 16-step
•
·
10% LED Output Current Accuracy
•
·
3% LED Output Current Matching
• Low-Current Shutdown Mode
• Built-in Thermal Protection
Figure 3.8.2. AAT3192 CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
15K
R402
4.7K
R448
VBAT
1u
C406
AAT3192-1
EUSY0238704
U402
1
7
2
6
10
9
4
8
3
5
IN
C-
GND
C+
D2
D1
EN_SET
OUT
RSET
NC
1u
C407
1u
C408
MLED2
MLED1
MLED
W_LED_DRV1
(15K ohm,1/16W,F,1005)
Содержание GS155
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