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PDF MP2481 Data sheet ( Hoja de datos )
| Número de pieza | MP2481 | |
| Descripción | White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP2481 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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The Future of Analog IC Technology
MP2481
36V, 1.2A, 1.4MHz
White LED Driver
DESCRIPTION
The MP2481 is a 36V, 1.2A, white LED driver
suitable for either step-down or inverting
step-up/down applications. It achieves 1.2A
peak output current over a wide input supply
range with excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization. Fault
condition protection includes thermal shutdown,
cycle-by-cycle peak current limiting, input over
voltage protection, open strings protection and
output short circuit protection.
The MP2481 incorporates both DC and PWM
dimming onto a single control pin. The separate
input reference ground pin allows for direct
enable and/or dimming control for a positive to
negative power conversion.
The MP2481 requires a minimum number of
readily available standard external components
and is available in 8-pin MSOP8E package.
EVALUATION BOARD REFERENCE
Board Number
Mode
EV2481-H-00A
Step-down
EV2481-H-01A
Step-up/down
FEATURES
1.2A Maximum Output Current
Unique Step-up/down Operation (Buck-
Boost Mode)
Wide 4.5V to 36V Operating Input Range for
Step-Down Applications (Buck Mode)
0.30Ω Internal Power MOSFET Switch
Fixed 1.4MHz Frequency
Analog and PWM Dimming
0.2V Reference Voltage
Up to 95% Efficiency
5μA Shutdown Mode
No minimum LED required
Stable with Low ESR Output Ceramic
Capacitors
Cycle-by-Cycle Over Current Protection
Thermal Shutdown Protection
Open Strings Protection
Input Over Voltage Protection
Output Short Circuit Protection
Available in 8-Pin MSOP8E Package
APPLICATIONS
General LED Illuminations
LCD Backlight Panels
Handheld Computers
Automotive Internal Lighting
Portable Multimedia Players
Portable GPS Devices
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Trademarks of Monolithic Power
Systems, Inc.
TYPICAL APPLICATION (STEP-UP/DOWN APPLICATION)
Efficiency vs. Input Voltage
4.5V-36V
VIN
ON OFF
DC or PWM INPUT
1 VDD
3
OVP
BST 7
C1 Cbs
SW 8
L1
MP2481
5 EN/DIM
D1 C2
6 INGND
VSS
2
FB 4
3 series, 9 paralleled
R1
R2
Rs
Step-up/down Application
90
85
80 4 series,400mA
3 series,400mA
75
3 series,9 paralleded,180mA total
70
65
60
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
MP2481 Rev. 1.43
www.MonolithicPower.com
7/10/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
1 page  
MP2481 –36V, 1.2A, 1.4MHz WHITE LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=12V, ILED=1A, one 5W WLED, Step-down application (refer to Figure 3), unless otherwise
noted.
Steady State Operation
PWM Dimming
fPWM=1kHz,DPWM=50%
Open Load Protection
VSW
10V/div.
VFB
200mV/div.
VOUT
AC Coupled
200mV/div.
IINDUCTOR
500mA/div.
400ns/div
VSW
10V/div.
VPWM
5V/div.
VOUT
2V/div.
ILED
500mA/div.
4
VOUT
2V/div.
VSW
10V/div.
ILED
1A/div.
2
Short Circuit Protection
Short LED+ to INGND
VSW
10V/div.
IINDUCTOR
500mA/div.
4
LED Current vs.
PWM Dimming Duty
fPWM=1kHz
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.2 0.4 0.6 0.8
PWM Dimming Duty
1.0
Efficiency vs.
Input Voltage
100
95
2 WLEDs in series,500mA
3 WLEDs in series,500mA
90
85
80
75
1 WLED,500mA 1 WLED,1A
70
65
60
0
10 20
30
INPUT VOLTAGE (V)
40
LED Current vs.
Analog Dimming Voltage
1.2
1.0
0.8
0.6
0.4
0.2
0
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
ANALOG DIMMING VOLTAGE (V)
MP2481 Rev. 1.43
www.MonolithicPower.com
7/10/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
5 Page 
MP2481 –36V, 1.2A, 1.4MHz WHITE LED DRIVER
TYPICAL APPLICATION CIRCUITS
6V-36V
VIN
1 VDD
3
OVP
BST 7
ON OFF
DC or PWM INPUT
SW 8
MP2481
5 EN/DIM
6 INGND
VSS
2
FB 4
C3
10nF
D1
B140
0.2
1%
LED1
39
10
4.5V-36V
VIN
ON OFF
DC or PWM INPUT
Figure 3—Step-Down White LED Driver Application
1 VDD
3
OVP
BST 7
SW 8
MP2481
5 EN/DIM
C3
10nF
D1
B140
3 series, 9 paralleled
6 INGND
VSS
2
FB 4
10
1.1
Figure 4—Step-up/down White LED Driver Application
4.5V-7.5V
VIN
ON OFF
DC or PWM INPUT
1 VDD
3
OVP
BST 7
SW 8
MP2481
5 EN/DIM
6 INGND
VSS
2
FB 4
C3
10nF
D1
B140
3 series, 9 paralleled
R1
100
R2
10
1.1
Figure 5—Optional Step-up White LED Driver Application
MP2481 Rev. 1.43
www.MonolithicPower.com
7/10/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MP2481.PDF ] | |
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