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參數(shù)資料
| 型號： | HV9903 |
| 廠商： | Supertex, Inc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | White LED Driver |
| 中文描述： | 白光LED驅(qū)動器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 326K |
| 代理商： | HV9903 |
Symbol
Parameter
Min
Typ.
Max
Unit
Conditions
-100
V
SHDN
= 0V
I
SHDN
SHDN input current
100
nA
V
SHDN
= 2V
f
SW
Inductor switching frequency
0.8
1.2
1.6
MHz
V
DD
= 2.6 to 4.6V
D
MAX
Maximum duty cycle
90
95
%
IL
IC Shutdown voltage (SHDN pin),
Off
0.9
V
IH
IC Start-up voltage (SHDN pin),
On
1.2
V
V
Open
Open LED indicator at R
SET
lead
2.0
V
DD
-
0.4V
V
DD
V
V
OUT
> 33V, R
SET
= 562
, V
DD
=
2.7V
I
SW(off)
Switch Off leakage current
100
nA
V
SW
= 5V
Pin Configuration
GND
LED
SW
SHDN
R
SET
V
DD
Top View
GND
Pin 1
Bottom View
Pin
Name Description
1
SW
Internal switch connection.
2
GND
Ground. The underside pads are internally connected to pin 2.
3
LED
Cathodes of the LEDs are connected to this pin.
4
R
SET
For programming the LED current and dimming function.
Also functions as a Fault output to indicate an open LED condition. R
SET
is pulled to V
DD
when an open LED condition is detected. The driver is
then latched off. To reset, the SHDN input must be asserted low.
An externally applied voltage greater than 100mV causes the LED
switch and PWM boost converter to shut off. The IC does not go into
low power standby and the soft-start circuit is not reactivated when V
Rset
again falls below 100mV.
5
SHDN
Shut down input. A logic low disables the IC and places it in low power
standby. A logic high enables the IC via a soft-start sequence.
6
V
DD
Input voltage supply pin. It is common practice to use a bypass
capacitor as close as possible to the device on this pin.
HV9903
HV9903
3
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