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參數資料
| 型號： | AT9933LG-G |
| 廠商： | SUPERTEX INC |
| 元件分類： | 穩壓器 |
| 中文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 4.90 X 3.90 MM, 1.75 MM HEIGHT, 1.27 MM PITCH, GREEN, MS-012AA, SOIC-8 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 505K |
| 代理商： | AT9933LG-G |
Supertex inc.
AT9933
Supertex inc.
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
Features
Constant current LED Driver
Steps input voltage up or down
Low EMI
Variable frequency operation
Internal 75V linear regulator
Input and output current sensing
Input current limit
Enable & PWM dimming
Ambient temperature rating up to 125°C
Meets AEC-Q100 requirements
Applications
Automotive LED Lighting
Reference Documents
AEC-Q100 Rev. F, 7/18/2003
SAE J1752-3
General Description
The AT9933 is a variable frequency PWM controller IC,
designed to control an LED lamp driver using a low-noise
boost-buck (uk) topology. The AT9933 uses patent-pending
hysteretic current-mode control to regulate both the input and
the output currents. This enables superior input surge immunity
without the necessity for complex loop compensation. Input
current control enables current limiting during startup, input
under-voltage and output overload conditions. The AT9933
provides a low-frequency PWM dimming input that can accept
an external control signal with a duty cycle of 0 - 100% and a
high dimming ratio.
The AT9933 based LED driver is ideal for automotive LED
lamps. The part is rated for up to 125°C ambient temperatures
and is AEC-Q100 compliant.
Typical Application Circuit
Hysteretic Boost-Buck (uk)
LED Driver IC
VIN
GATE
CS1
GND
VDD
PWMD
CS2
REF
VDC
L
1
L
2
C
1
Q
1
D
1
R
CS1
R
S2
R
REF2
R
REF1
R
S1
C
2
D
2
(optional)
VO
+
-
C
3
R
CS2
D
3
R
D
C
D
AT9933
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