參數(shù)資料
型號: MP1518
廠商: Monolithic Power Systems, Inc.
英文描述: Fixed Frequency White LED Driver
中文描述: 固定頻率白光LED驅(qū)動器
文件頁數(shù): 3/9頁
文件大?。?/td> 260K
代理商: MP1518
MP1518 – FIXED FREQUENCY WHITE LED DRIVER
MP1518 Rev. 1.6
7/25/2006
www.MonolithicPower.com
3
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
ELECTRICAL CHARACTERISTICS
(continued)
V
IN
= V
EN
= 5V, T
A
= +25
°
C, unless otherwise noted.
Parameters
Enable
EN Threshold
EN Threshold
EN Hysteresis
EN Input Bias Current
Feedback
FB Voltage
FB Input Bias Current
Output Switch
SW On-Resistance
(4)
SW Current Limit
(4)
Thermal Shutdown
(4)
Symbol
Condition
Min
Typ
Max Units
V
EN
Rising
V
EN
Rising, V
IN
= 2.5V
V
EN
= 0V, 5V
1.0
0.8
1.35
90
1.6
1
V
V
mV
μA
V
FB
= 0.1V
94
-600
104
-300
114
mV
nA
R
ON
Duty Cycle = 60%
0.5
350
160
mA
°
C
Notes:
4) Guaranteed by design.
PIN FUNCTIONS
TSOT23-6
Pin #
QFN8
Pin #
Name Pin Function
1
8
SW
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect
the power inductor and output rectifier to SW. SW can swing between GND and
25V.
Ground.
Feedback Input. The MP1518 regulates the voltage across the current sense
resistor between FB and GND. Connect a current sense resistor from the bottom
of the LED string to GND. Connect the bottom of the LED string to FB. The
regulation voltage is 104mV.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a
low input turns it off. When not used, connect EN to the input source for
automatic startup.
The EN pin cannot be left floating.
Over Voltage Input. OV measures the output voltage for open circuit protection.
Connect OV to the output at the top of the LED string.
Input Supply Pin. Must be locally bypassed.
2
1, 5
GND
3
6
FB
4
4
EN
5
3
OV
6
2
IN
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