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PDF LD5850 Data sheet ( Hoja de datos )
| Número de pieza | LD5850 | |
| Descripción | Boost Controller | |
| Fabricantes | Leadtrend Technology | |
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Hay una vista previa y un enlace de descarga de LD5850 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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LD5850
11/30/2012
Boost Controller for LED Backlight
REV: 00
General Description
The LD5850 is a wide-input asynchronous current mode
boost controller, capable to operate in the range between
9V and 28V and to generate 14V of voltage to the GATE
pin of MOSFET to reduce thermal loss. The current mode
control architecture enhances transient response and
simplifies the loop compensation. The DIM input allows
the brightness control for LED Backlight or LED lighting.
The Device also features internal slope compensation,
input voltage under-voltage lockout, output voltage short
circuit protection, cycle-by-cycle current limit and thermal
shutdown protection.
Features
Wide Input Range: 9V to 28V
Current Mode Control
0.3V LED Feedback Current Sensing Reference
Fixed Switching Frequency
PWM Dimming Input
Internal Slope Compensation
Cycle-by-Cycle Current Limit
Over Temperature Protection
Applications
LED TV Backlight
LED Monitor Backlight
LED lighting
Typical Application
VIN
VOUT
RA
VCC
124
VCC DRV CS
DIM
8 DIM LD5850 FB 5
OVP COMP GND
763
COVP
RCS
RFB
RB
Fig. 1 Application circuit
Leadtrend Technology Corporation
LD5850-DS-00 November 2012
1
www.leadtrend.com.tw
1 page  
Electrical Characteristics
(VCC=12V, TA=25C, unless otherwise noted.)
PARAMETER
CONDITIONS
Input Power (VCC)
Turn On Level
UVLO(on)
Turn Off Level
UVLO(off)
Shutdown Current
DIM=Low, over 200ms
Standby Current
DIM=Low
Operating Current
DIM=High,
Switching at no load
Boost Converter
Switching frequency
Boost Maximum duty cycle
Switching frequency=180KHz
DRV gate drive
Source current, VIN=12V
Sink current, VIN=12V
Output High Clamp Level
VCC=24V
DRV pin Rising Time
DRV pin load=1nF
DRV pin Falling Time
DRV pin load=1nF
COMP clamp voltage
Feedback (FB)
Reference Voltage
Tolerance of Reference Voltage
PWM Dimming (DIM)
DIM Voltage threshold
Enable
Disable
Resistance from DIM pin to GND
PWM dimming frequency
Dimming Duty-Cycle
Shutdown Recover Delay Time
(TDOWN)
Current Sensing (CS)
(Note 1)
Current Sense Input Threshold
Voltage
LEB time
MIN.
7
162
85
3.6
-3
2
0.1
0
0.45
LD5850
TYP.
40
1
5
MAX. UNITS
8.7 V
V
A
mA
mA
180 198 KHz
90 95 %
1.2 A
1.3 A
14 V
75 ns
75 ns
3.8 4.0 V
0.3 V
3%
V
0.8 V
600 K
1 KHz
100 %
200 ms
0.5 0.55 V
275 nS
Leadtrend Technology Corporation
LD5850-DS-00 November 2012
5
www.leadtrend.com.tw
5 Page 
Revision History
Rev. Date
00 11/30/2012 Original Specification
Change Notice
LD5850
Leadtrend Technology Corporation
LD5850-DS-00 November 2012
11
www.leadtrend.com.tw
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LD5850.PDF ] | |
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