LP3936 Datasheet, PDF (14/30 Pages) National Semiconductor (TI) – Lighting Management System for Six White LEDs and One RGB or FLASH LED

LP3936
SNVS259D – NOVEMBER 2003 – REVISED MAY 2013
1 MHz clock
Duty control
V_IN
OUT
FB
OVPCOMP
R
+
S
-
R
RESETCOMP
-
+
ERRORAMP
SLOPER ^VREF ₊
-
+
-
+
-
OLPCOMP
R
R
LOOPC
V_OUT
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Figure 13. Magnetic Boost DC/DC Converter – Boost Topology with Protection Circuitry
Boost Output Voltage Control
User can control the boost output voltage by boost output 8-bit register.
8-Bit Boost Output Voltage Control Register Description
Boost[7:0]
Register 0Dh
BOOST Output Voltage
(typical)
Binary
Hex
0000 0000
00
4.10
0000 0001
01
4.25
0000 0011
03
4.40
0000 0111
07
4.55 Default
0000 1111
0F
4.70
0001 1111
1F
4.85
0011 1111
3F
5.00
0111 1111
7F
5.15
1111 1111
FF
5.30
5.3
4.1
V_IN = 3.6V
I_LOAD = 50 mA
Control = 00 - FF - 07
V_OUT = 4.1V - 5.3V - 4.55V
TIME (200 Ps/DIV)
Figure 14. Boost Output Voltage Control
14
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