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參數資料
| 型號： | PTB78560CAH |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, DIP11 |
| 文件頁數： | 13/27頁 |
| 文件大?。?/td> | 643K |
| 代理商： | PTB78560CAH |
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1
5
6
3
4
2
Track
GND
Inhibit
Adjust
1
5
6
3
4
2
Track
GND
Inhibit
Adjust
5
1
3
4
5
9
11
10
8
7
6
2
Track
Sense
VI
NEN
PEN
VO Seq
+Sense
VO Bus
VO Adjust
VO COM
CI
100
F
VI
+VI
C2
220
F
R1
5.36 k
C3
47
F
U2
PTH04000W
VO Seq
(3.3 V)
VPOL1
(2.5 V)
VPOL2
(1.8 V)
C4
47
F
C6
47
F
R3
6.65 k
C5
47
F
R2
2.32 k
VO
VI
VO
U3
PTH04000W
U1
PTB78560B
VI
+VI
Power-Up Sequencing Without A VOSEQ Output (PTB78560A/C)
SLTS249 – JUNE 2005
Figure 28. Power-Up Sequencing With Nonisolated POL Modules
Although the PTB78560A or PTB78560C do not have a VOSeq output, they can provide the input power and
coordinate the power-up sequencing to two or more nonisolated, Auto-Track compliant power modules.
Figure 30 shows the PTB78560A (5 V) converter (U1) configured to provide both the input source and the
power-up sequence timing to two 5-V input nonisolated modules. The example shows two PTH04000W modules
(U2 and U3), each rated for up to 3 A of output current. In this case, the number of downstream modules, and
their respective output voltage and load current rating, is only limited by the amount of current available at the
VOBus output.
The output voltage of the PTB78560 must be set to a valid intermediate supply voltage. This depends on the
input voltage requirements of the downstream modules. For 5-V input modules, the PTB78560A is selected and
adjusted for an output of 5 V. For 12-V input modules, the PTB78560C is used and adjusted for an output of
12 V. U2 and U3, can be set to any voltage over their applicable adjustment range. In this example, they are
again set to 2.5 V (R2 = 2.32 k
) and 1.8 V (R3 = 6.65 k), respectively. Figure 29 shows the power-up
waveforms from Figure 30 when the Track control of all three modules are simply connected together.
The PTB78560 converter (U1) provides the required intermediate voltage from the VOBus output to power the
downstream modules, while holding the common Track control at ground potential. After allowing times for U2
and U3 to initialize, U1 removes the ground from the Track control, allowing this voltage to rise. The outputs
from the two nonisolated modules then rise simultaneously to their respective set-point voltages.
20
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