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MP2481 Datasheet(PDF) 6 Page - Monolithic Power Systems

Part # MP2481
Description  36V, 1.2A, 1.4MHz White LED Driver
PDF  12 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2481 Datasheet(HTML) 6 Page - Monolithic Power Systems

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MP2481 –36V, 1.2A, 1.4MHz WHITE LED DRIVER
MP2481 Rev. 1.42
www.MonolithicPower.com
6
4/28/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=12V, ILED=180mA, 3 WLEDs in series, 9 strings, Step-up/down application (refer to Figure 4),
unless otherwise noted.
Steady State Operation
Short Circuit Protection
PWM Dimming
Open Load Protection
PWM Dimming Duty
Short LED+ to VSS
fPWM=1kHz,DPWM=50%
VSW
10V/div.
VPWM
5V/div.
VSS
2V/div.
VSS
5V/div.
VSW
20V/div.
VSW
20V/div.
IINDUCTOR
500mA/div.
ILED
200mA/div.
ILED
200mA/div.
VSS
AC Coupled
200mV/div.
4
400ns/div
4
2
VSW
10V/div.
IINDUCTOR
500mA/div.
LED Current vs.Analog
Dimming Voltage
LED Current vs.
PWM Dimming Duty
0.4
0
0.2
0.4
0.6
0.8
1.0
0
20
40
60
80
100
120
140
160
180
200
0.6 0.8 1.0 1.2 1.4 1.6 1.8
ANALOG DIMMING VOLTAGE (V)
Efficiency vs.
Input Voltage
60
65
0
5
10
15
20
25
30
70
75
80
85
90
INPUT VOLTAGE (V)
0
20
40
60
80
100
120
140
160
180
200
fPWM=1kHz
4 series,400mA
3 series,400mA
3 series,9 paralleded,180mA total



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