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PAM2846 の電気的特性と機能

PAM2846のメーカーはPower Analog Micoelectronicsです、この部品の機能は「Integrated 6 String LED Boost Type Driver」です。


製品の詳細 ( Datasheet PDF )

部品番号
PAM2846
部品説明
Integrated 6 String LED Boost Type Driver
メーカ
Power Analog Micoelectronics
ロゴ

Power Analog Micoelectronics ロゴ 




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PAM2846 Datasheet, PAM2846 PDF,ピン配置, 機能
PAM2846
Integrated 6 String LED Boost Type Driver
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 Self-adaptive Vout to Fit Different LED Number
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 Low 400mV Feedback Voltage at Full
Current Improves Efficiency
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 Open LED Protection: Adjustable Clamp
Voltage
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
www.DataSheet4U.com
Description
The PAM2846 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 PAM2846 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. The device is able to
adapt to different numbers of LEDs in each string
or different forward voltage for different types of
LEDs and keep the string current constant.
Separate feedback loops limit the output voltage if
one or more LEDs open or short. The limit voltage
of over voltage protection is adjustable by
changing the feedback resistor ratio. The
PAM2846 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 PAM2846 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
VIN: 4.8V to 28V
22μH
L
0-10k
100nF
PWMD
Fsel
ENA
PWMD
Fsel
VIN
SW
SW
SW
OVP
PAM2846
VC
Vcc-5V
Vcc-driver
Iset
10K
LED1
LED2
LED3
LED4
LED5
LED6
GND
PGND PGND PGND
3A/40V
R1
300k
R2
9.2k
Total 10
LEDs
per
string
Power Analog Microelectronics,Inc
www.poweranalog.com
1
07/2008 Rev 1.2

1 Page





PAM2846 pdf, ピン配列
PAM2846
Integrated 6 String LED Boost Type Driver
Pin Configuration
QFN 4mmX4mm
24 23 22 21 20 19
1
2
P2846
3 XXXYW
4
5
6
18
17
16
15
14
13
7 8 9 10 11 12
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
www.DataSheet4U1.0com
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Name
VIN
Vcc-driver
GND
ENA
PWMD
LED1
LED2
LED3
GND
GND
LED4
LED5
LED6
Iset
Vcc-5V
VC
Fsel
OVP
PGND
PGND
PGND
SW
SW
SW
XXX: Internal Code
Y: Year
W: Weekly
Description
Supply input
5V linear regulator output for power MOS driver
Ground
Enable input
PWM dimming control
LED1 cathode terminal
LED2 cathode terminal
LED3 cathode terminal
Ground
Ground
LED4 cathode terminal
LED5 cathode terminal
LED6 cathode terminal
LED current adjustment pin
5V linear regulator output
Boost stage compensation pin
Oscillator frequency selection pin
Over voltage protection
Power ground
Power ground
Power ground
Power MOS drain
Power MOS drain
Power MOS drain
Power Analog Microelectronics,Inc
www.poweranalog.com
3
07/2008 Rev 1.2


3Pages


PAM2846 電子部品, 半導体
PAM2846
Integrated 6 String LED Boost Type Driver
Electrical Characteristic
TA=25°C, VIN=ENA=12V, L=22μH, Rset=10kΩ, unless otherwise noted .
PAR AMET ER
Conditions
Min
LED Controller Stage
I=190*1.2V/Riset, Riset=7.68k
Full-Scale LED_Output Current
I=190*1.2V/Riset, Riset=11.3k
I=190*1.2V/Riset, Riset=22.6k
LED current matching
-3
Iset Voltage
Minimums LED voltage
Analog Dimming Range
I=190*1.2V /Riset
I/32
PWM Dimming Frequency
100
Fault Protection
LED_ Overvoltage Threshold
4.6
LED_ Overvoltage Hysteresis
Overvoltage Threshold
Overvoltage Hysteresis
Thermal-Shutdown
Thermal-Shutdown Hysteresis
Controll Interface
EN High
1.5
EN Low
PWMD High
1.5
PWMD Low
www.DataSheet4U.com
Fsel High
Vcc_5V- 0.5
Fsel Midlevel
1
Fsel Low
EN Min pulse width
single wire dimming low level
0.5
EN Max pulse width
single wire dimming low level
EN off delay
single wire dimming low level
Typ
30
20
10
1
1.2
400
4.9
1
1.2
80
150
30
200
Max Units
mA
mA
mA
+3 %
V
mV
I mA
1k Hz
5.1 V
V
V
mV
°C
°C
V
0.4 V
V
0.4 V
V
2V
0.5 V
μs
10 μs
μs
Power Analog Microelectronics,Inc
www.poweranalog.com
6
07/2008 Rev 1.2

6 Page

合計 : 14 ページ
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[ PAM2846 データシート.PDF ]

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