LP5526TLEV National Semiconductor, LP5526TLEV Datasheet - Page 16

• Manufacturer Part Number: LP5526TLEV
• Description: BOARD EVAL LP5526 LMU LED DRIVER
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP5526TLEV

• Current - Output / Channel: 150mA
• Outputs And Type: 2 (25mA), 1 (150mA)
• Voltage - Output: 20 V
• Features: Camera Flash, Dimmable, RGB Controller
• Voltage - Input: 3 ~ 5.5V
• Utilized Ic / Part: LP5526
• Lead Free Status / RoHS Status: Not applicable / Not applicable

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When RLED, GLED and BLED are connected together as in
Typical Application 1, flash current can be adjusted with
8.33% step in constant current mode by changing RGB max
current register values as seen on following table. Note that
0% means that appropriate output is turned off by setting
RSW, GSW or BSW bit to 0.
I
R
100
25
50
75
[%]
0
0
0
0
0
0
0
0
I
G
100
100
100
100
100
25
50
75
0
0
0
0
[%]
I
B
100
100
100
100
100
100
100
100
100
25
50
75
[%]
Total current [%]
16.67
25.00
33.33
41.67
50.00
58.33
66.67
75.00
83.33
91.67
8.33
100
Using Flash Mode
16
3. Using Flash Mode
In this mode Flash is triggered with external PWM pin and pre-
flash brightness is adjusted by adjusting the RGB max current
values. After flash pulse flash led will be shut down.
•
•
•
•
•
•
•
•
Note: EN_FLASH bit must be set low, and then high again
before it is possible to make a new flash pulse.
Write the pre-flash current values to RGB max current
register
Enable RGB functions and disable PWM mode (EN_RGB
= 1, RGB_PWM = 0)
Enable flash mode (EN_FLASH = 1), make sure GPIO[0]/
PWM pin is in low state
Enable external PWM pin (EN_PWM_PIN = 1)
Start pre-flash by switching on the LEDs (RSW = 1, GSW
= 1, BSW = 1). Pre-flash brightness can be affected also
by setting on only one or two LEDs
Use EN_EXT_R_PWM, EN_EXT_G_PWM and
EN_EXT_B_PWM bits to select which LED outputs are
used for flash
Start flash pulse by setting GPIO[0]/PWM pin high and
stop it by setting GPIO[0]/PWM pin low
During the flash pulse the LED outputs with
EN_EXT_x_PWM bit enabled give out maximum current,
regardless of RGB max current register value or XSW
values
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