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參數(shù)資料
| 型號： | AAT1236IRN-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | High Efficiency White LED Drivers for Backlight and Keypad |
| 中文描述： | 高效率白光LED的背光和鍵盤驅(qū)動程序 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 1009K |
| 代理商： | AAT1236IRN-T1 |
AAT1236
High Efficiency White LED Drivers
for Backlight and Keypad
10
1236.2007.02.1.1
Functional Block Diagram
Boost
Converter
Control
EN
VIN
LIN
IN
SW
I
2
C Interface
ROM
V
(A1, A2, A3)
V
REF
V
(B1, B2)
V
REF
B1
A3
A2
A1
B2
D/A
ROM
Max Current
Adjustment
RSET
AGND
OV
GND
SCL
SDA
D/A
D/A
D/A
D/A
Functional Description
The AAT1236 consists of a controller for the step-up
switching converter and its power switch, and five
regulated current sinks programmable over 16 lev-
els into two groups, which can be turned on/off indi-
vidually. An external Schottky diode, a power induc-
tor, an output capacitor, and a resistor divider are
required to complete the solution.
The AAT1236's boost controller is designed to
deliver 100mA up to 24V. The AAT1236 is capable
of driving a total of five channels divided into two
groups with four white LEDs connected in series at
each channel.
The output load current can be programmed by the
current sink magnitudes. I
2
C interface program-
ming allows independent control of two groups of
current sinks (A1 to A3 and B1 to B2) and control
on/off with a different configuration on each chan-
nel. Unused sink channel(s) must be connected to
AGND to ensure proper function of the AAT1236.
Control Loop
The AAT1236 provides the benefits of current
mode control with a simple hysteretic output cur-
rent loop providing exceptional stability and fast
response with minimal design effort. The device
maintains exceptional constant current regulation,
transient response, and cycle-by-cycle current limit
without additional compensation components.
The AAT1236 modulates the power MOSFET
switching current to maintain the programmed sink
current through each channel. The sink voltage at
each channel is monitored and the controller pro-
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