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What is PAM2845?

This electronic component, produced by the manufacturer "Power Analog Micoelectronics", performs the same function as "40V High Power Boost Convertor".


PAM2845 Datasheet PDF - Power Analog Micoelectronics

Part Number PAM2845
Description 40V High Power Boost Convertor
Manufacturers Power Analog Micoelectronics 
Logo Power Analog Micoelectronics Logo 


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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

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PAM2845 equivalent
PAM2845
40V High Power Boost Convertor
with 6 Channel Constant Current Source
Electrical Characteristic
TA=25°C, V =IN ENA=12V, L=22μH, Rset=10kΩ, unless otherwise noted
PARAMETER
Conditions
Input Voltage Range
ENA=high (no switching)
Fsel=high (1.6M switching frequency)
Quiescent Current
Fsel =high (1M switching frequency)
Fsel =high (500k switching frequency)
ENA=low
LDO Stage
Vcc_5V
Vcc_5V current_limit
Vcc_5V UVLO Threshold
Vcc_5V UVLO Hysteresis
Vcc_driver
Vcc_driver current_limit
Vcc_driver UVLO Threshold
Vcc_driver UVLO Hysteresis
Boost Stage
Feedback Voltage
Switch Rdson
Vcc_5V=5V
Switch Current Limit
Switch Leakage Current
www.DataSheet4U.com
Switching Frequency
Fsel =Vcc_5V
Fsel =Open
Fsel =Gnd
Fsel =Vcc_5V
Minimums Duty Cycle
Fsel =Open
Fsel =Gnd
Maximums Duty Cycle
VC Source Current
VC Sink Current
Min
4.8
4.5
14
3.9
4.5
14
3.9
Typ Max Units
28 V
12
10
mA
6
3
5 20 μA
5 5.5 V
74 90 mA
4.2 4.5
V
70 mV
5 5.5 V
74 90 mA
4.2 4.5
V
70 mV
1.2 V
0.2 Ω
2.5 A
1 μA
1.6 MHz
1.0 MHz
500 kHz
20 %
10 %
5%
90 %
60 μA
60 μA
Power Analog Microelectronics,Inc
www.poweranalog.com
5
08/2008 Rev 1.0


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for PAM2845 electronic component.


Information Total 14 Pages
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