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Power Analog Micoelectronics

PAM2845 Datasheet Preview

PAM2845 Datasheet

40V High Power Boost Convertor

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PAM2845
40V High Power Boost Convertor
with 6 Channel Constant Current Source
Features
n Six Constant-Current Output Channels
n Parallel Channels Allow Higher Current
per LED String
n Maximum 40V Continuous Voltage Output
Limit for Each Channel
n Adjustable Constant Output Voltage
n Adjustable Constant LED Current
n Drives 10 or more LEDs Each String as Long
as the String Voltage Less Than 40V
n Internal 2.5A Power MOSFET
n Allows Digital PWM and Analog Dimming
n Wide (100:1) PWM Dimming Range without
Color Shift
n Independent Dimming and Shutdown
Control of the LED Driver
n ±1% Typical Current Matching between Strings
n Short LED Protection
n 3 Frequencies Selection: 1.6MHz/1MHz/500kHz
n Wide Input Voltage Range: 4.8V to 28V
n Over Temperature Protection
n Available in 24-pin 4mmx4mm QFN Package
n Pb-free Package
Applications
n White or RGB Backlighting for LCD
TV, LCD Monitor, Notebook, Handy
Terminals, and Avionics Displays Panels
n LED Lighting Devices
Description
The PAM2845 is a high-efficiency boost type LED
driver. It is designed for large LCD panel that
employs an array of LEDs as back light source.
The PAM2845 employs a current-mode step-up
converter that drives six parallel strings of LEDs
connected in multiple series. This built-in string-
current-control circuit achieves ±1% typical
current matching between strings, which ensures
even brightness for all LEDs.
Separate feedback loops limit the output voltage if
one or more LEDs open or short. The PAM2845
has features cycle-by-cycle current limit to
provide consistent operation and soft-start
capability. A thermal-shutdown circuit provides
another level of protection.
The PAM2845 has a wide +4.8V to +28V input-
voltage range and provides adjustable full-scale
LED current. The switching frequency of this
device can be selected among 500kHz, 1MHz and
1.6MHz according to the application
requirements.
Typical Application
www.DataSheet4U.com
VIN: 4.8V to 28V
10μF
22μH
L
100nF
PWMD
Fsel
ENA
PWMD
Fsel
VIN
SW
SW
SW
FB
PAM2845
VC
Vcc-5V
Vcc-driver
1μF 1μF
Iset
10kΩ
LED1
LED2
LED3
LED4
LED5
LED6
GND
PGND PGND PGND
3A/40V
R1
270kΩ
R2
9.1kΩ
10μF
Total 10
LEDs
per
string
Power Analog Microelectronics,Inc
www.poweranalog.com
1
08/2008 Rev 1.0




Power Analog Micoelectronics

PAM2845 Datasheet Preview

PAM2845 Datasheet

40V High Power Boost Convertor

No Preview Available !

Block Diagram
VIN
PAM2845
40V High Power Boost Convertor
with 6 Channel Constant Current Source
Vcc-5V
Vcc-driver
ENA
VC
PWMD
LDO1
LDO2
ENABLE
UVLO
OTP
Bandgap
POR
PWM DIMMING
SOFT START
1.6MHz
800KHz
500KHz
1.2V EA
SLOPE
COMPENSATION
PWM
COMPATATOR
+
MAIN
CONTROL
Level Shift Driver
CURRENT
LIMIT
CS AMP
I_set AMP
Iset
www.DataSheet4U.com
led short protect led short protect led short protect led short protect led short protect led short protect
GND
FB
Fsel
SW
PGND
LED1
LED2
LED3
LED4
LED5
LED6
Power Analog Microelectronics,Inc
www.poweranalog.com
2
08/2008 Rev 1.0


Part Number PAM2845
Description 40V High Power Boost Convertor
Maker Power Analog Micoelectronics
Total Page 14 Pages
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