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PDF PAM2841 Data sheet ( Hoja de datos )
| Número de pieza | PAM2841 | |
| Descripción | 40V PRECISION WLED DRIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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A Product Line of
Diodes Incorporated
PAM2841
1.5A SW CURRENT, 40V PRECISION WLED DRIVER
Description
The PAM2841 is a white LED driver, capable of driving 10 or more
WLEDs in series (depending on forward voltage of the LEDs) with a
range of input voltages from 2.7V to 5.5V.
The PAM2841 features over current protection, over voltage
protection, under voltage lockout and over temperature protection,
which prevent the device from damage.
LED dimming can be done by four methods as described in the
Application Information hereinafter.
Pin Assignments
Features
Capable of Driving 10 or More WLEDs
Chip Enable with Soft-Start
Analog and PWM Dimming
Peak Efficiency up to 90%
Low Quiescent Current
Fixed Frequency of 1MHz
Over Current Protection
Over Voltage Protection
Thermal Protection
UVLO
Tiny Pb-Free Packages (RoHS Compliant):
MSOP-8 and DFN 2X2
Applications
WLED Driver System
Typical Applications Circuit
PAM2841
Document number: DSxxxxx Rev. 1 - 5
1 of 16
www.diodes.com
September 2013
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
PAM2841
Typical Performance Characteristics (@TA = +25°C, VDD = 5V, unless otherwise specified.)
PAM2841
Document number: DSxxxxx Rev. 1 - 5
5 of 16
www.diodes.com
September 2013
© Diodes Incorporated
5 Page 
A Product Line of
Diodes Incorporated
PAM2841
Application Information (cont.)
3). Using a DC Voltage
For some applications, a simple and direct way to control brightness is use an external variable DC voltage to vary the voltage drop on feedback
resistor. This will make the PAM2841 adjust the output current to follow the change of feedback voltage. The circuit is shown in Figure 3. As the
DC voltage increases, the voltage drop on R4 increases and the voltage drop on R3 decreases. Thus, the LED current decreases. The selection
of R4 and R5 will make the current from the variable DC source much smaller than the LED current and much larger than the FB pin current. For
VCC range from 0V to 2V, the selection of resistors in Figure 3 gives dimming control of LED current from 0mA to 20mA.
Figure 3
4). Using a Filtered PWM Signal
The filtered PWM signal can be considered as an adjustable DC voltage. Such regulated signal is often with some grade of ripple because of
some simple configuration of circuit. With appropriated arrangement of PWM frequency and level, and filter parameters, it can be used to replace
the variable DC voltage source in dimming control.
The circuit is shown in Figure 4.
PAM2841
Document number: DSxxxxx Rev. 1 - 5
Figure 4
11 of 16
www.diodes.com
September 2013
© Diodes Incorporated
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet PAM2841.PDF ] | |
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