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TPS54900PW 데이터시트(PDF) 7 Page - Texas Instruments

부품명 TPS54900PW
상세설명  PROGRAMMABLE FOUR-CHANNEL STEP-DOWN DC/DC CONVERTER
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TPS54900
SLVS405 – OCTOBER 2001
7
www.ti.com
serial command bit assignments
SERIAL BIT
POSITION
NAME
DESCRIPTION
15
R/W
Set to logic 1 to read from TPS54900, set to logic 0 to write to TPS54900
14
ADR2
Channel bank select, compared to logic state of CBS pin to select between two TPS54900 devices used in an
8-channel configuration
13
ADR1
Internal channel select MSB, used with ADR0 to select one of four output channels
12
ADR0
Internal channel select LSB, used with ADR1 to select one of four output channels
11
S3
Device address MSB (S3 = 1 required to address TPS54900)
10
S2
Device address bit (S2 = 1 required to address TPS54900)
9
S1
Device address bit (S1 = 1 required to address TPS54900)
8
S0
Device address LSB (S0 = 1 required to address TPS54900)
7
D7
Voltage programming MSB
6
D6
Voltage programming bit
5
D5
Voltage programming bit
4
D4
Voltage programming LSB
3
D3
Channel enable/disable (D3 = 0 enables channel(s))
2
D2
Global start
1
D1
Unassigned
0
D0
Initialize counters
valid commands
WORD
DESCRIPTION
00001111 00001001
Initialize PWM clocks with phase stagger and disable all channels
0ddd1111 vvvv0100
Turn on and regulate all channels to voltage code vvvv (see voltage programming code table)
0aaa1111 vvvv0000
Turn on and regulate channel aaa to voltage code vvvv (see voltage programming code table)
0aaa1111 dddd1000
Disable channel aaa
1aaa1111 dddddddd
Read channel status from channel aaa
NOTE: aaa:
three bit channel address, 0aa: corresponds to CBS pin < VIL
1aa:
corresponds to CBS > VIH
vvvv:
voltage programming code
d:
don’t care state
voltage programming codes
VOLTAGE CODE
(D4–D7)
Figure 1
VOLTAGE CODE
(D4–D7)
OUTPUT VOLTAGE
0
7.5
8
10.7
1
7.9
9
11.1
2
8.3
A
11.5
3
8.7
B
11.9
4
9.1
C
12.3
5
9.5
D
12.7
6
9.9
E
13.1
7
10.3
F
Pass through mode


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