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參數(shù)資料
| 型號： | CAT37TDI-TE7 |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | CMOS White LED Driver Boost Converter |
| 中文描述： | 的CMOS白光LED驅(qū)動器升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 566K |
| 代理商： | CAT37TDI-TE7 |
CAT37
6
Doc. No. 5005, Rev. S
2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
OPERATION
The CAT37 device is a high efficiency, constant
frequency, current regulating boost driver for white LEDs.
The device includes a switch and an internally
compensated loop for the regulation of the current in the
LEDs.
Operation can be best understood by examining the
block diagram. The FB pin is regulated at 95 mV and the
current through the external resistor will set the regulated
current in the LEDs at:
I
LED
= 0.095/R1
While maintaining LED current regulation, the CAT37
boost converter automatically adjusts the FB pin voltage
to be as low as possible. A low FB pin voltage ensures
high efficiency.
Current through the internal power switch is continuously
monitored cycle-by-cycle. If the current limit is exceeded,
the switch is immediately turned off, protecting the
device, for the remainder of the cycle.
PWM dimming operation can be achieved by switching
the
SHDN
pin or by pulling the FB pin higher than 95mV.
BLOCK DIAGRAM
Figure 2. CAT37 Block Diagram
VIN
1.2 MHz
Clock
PWM
& Logic
+
-
D1
L1
VIN
C1
2
FB
3
Current
Sense
Amp
SW
1
5
CAT37
Error
Amp
C2
4
SHDN
GND
0.095V
REF
ILED
R1
+
-
Over Voltage
Protection
(22V)
Note: SOT23 Pin Numbers are shown
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