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LP8543 Datasheet(PDF) 19 Page - Texas Instruments

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Part # LP8543
Description  High-Voltage DC/DC Boost Converter With Integrated FET
PDF  40 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LP8543 Datasheet(HTML) 19 Page - Texas Instruments

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100
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DISPLAY1 CONFIG
4
5
1
3
6
1
3
5
7
25
50
75
1-4
1-5
1-6
1-7
4
5
6
1
2
3
1
2
3
2
4
2
4
LP8543
www.ti.com
SNVS604D – AUGUST 2009 – REVISED MARCH 2013
Phase shift frequency can either be the same as the PWM frequency or a lower frequency can be selected with
<PHASE_SHIFT_FREQ[1:0]> EEPROM bits. At highest 19.5 kHz PSPWM frequency, the boost will use a
constant voltage based on the highest VF string because of timing constraints of the high PWM frequency.
PSPWM is enabled by default, but it can be disabled by setting <DISABLE_PS> EEPROM bit to 1.
Two PSPWM modes are available. PSPWM mode is selected with <PWM_MODE> EEPROM bit. Difference
between modes is in the PWM frequencies available. PWM and PSPWM frequency settings are shown in
Table 4.
Number of strings simultaneously on in PSPWM mode with different PWM values and different output
configurations is shown in the following diagram.
Figure 14. Number of Simultaneously Active Strings
Table 4. PSPWM Frequency Selection in EEPROM Registers (N = number of strings used)
PWM_MODE = 0
PWM_MODE = 1
PWM_FREQ[2:0] +
PWM Frequency
Shift Frequency
Output Frequency
Output Frequency
Shift Frequency
PSPWM_FREQ[1:0]
(Hz)
(Hz)
(Hz)
(Hz)
(Hz)
00000
992
992
992/N
229
229 x N
00001
992
496
496/N
305
305 x N
00010
992
248
248/N
381
381 x N
00011
992
124
124/N
458
458 x N
00100
1526
1526
1526/N
534
534 x N
00101
1526
763
763/N
610
610 x N
00110
1526
382
382/N
687
687 x N
00111
1526
191
191/N
763
763 x N
01000
1983
1983
1983/N
839
839 x N
01001
1983
993
993/N
916
916 x N
01010
1983
496
496/N
992
992 x N
01011
1983
248
248/N
1068
1068 x N
01100
2441
2441
2441/N
1144
1144 x N
01101
2441
1221
1221/N
1221
1221 x N
01110
2441
610
610/N
1297
1297 x N
01111
2441
305
305/N
1373
1373 x N
10000
2974
2974
2974/N
1450
1450 x N
10001
2974
1487
1487/N
1526
1526 x N
10010
2974
744
744/N
1602
1602 x N
10011
2974
372
372/N
1678
1678 x N
Copyright © 2009–2013, Texas Instruments Incorporated
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