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參數(shù)資料
| 型號： | PTB78520WAS |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | DIP-10 |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 443K |
| 代理商： | PTB78520WAS |
Application Notes
For technical support and further information visit http://power.ti.com
PTH03050W
15
6
3
4
2
Track
VIN
VO
GND
Inhibit
Adjust
PTH03050W
15
6
3
4
2
Track
VIN
VO
GND
Inhibit
Adjust
R1
887
C3
100 F
C4
100 F
R2
2.21 k
R3
5.49 k
C1
100 F
Vo Seq (3.3 V)
VPOL1 (2.5 V)
VPOL2 (1.8 V)
+VI
–VI
C2
100 F
PTB78520W
VO Bus
VO Seq
+VI
–VI
+Sense
VO Adjust
–Sense
VO COM
VO Enable
Track
1
2
3
4
8
10
9
7
6
5
U1
U2
U3
Figure 2-2; Power-Up Sequencing Circuit With PTB78520W & Non-Isolated POL Modules
V Bus (1 V/Div)
o
V Seq (1 V/Div)
o
V
1 (1 V/Div)
POL
V
2 (1 V/Div)
POL
HORIZ SCALE: 20 ms/Div
t =20 ms
d
Figure 2-3; PTB78520 Power-Up Waveforms with POL Modules
Typical Power-Up Sequencing Configuration
Figure 2-2 shows how the PTB78520W (U1) can be
configured to provide two 3.3 V sources, that allow it to
both power and sequence with one or more non-isolated
POL modules. The example shows two PTH03050W
modules (U2 & U3), each rated for up 6 A of output current.
Additional voltages, as well as modules with a higher
output current capability can also be specified to meet a
specific application. The number of downstream modules,
their respective output voltage and load current rating is
only limited by the amount of current available at the
‘VO Bus’ output. This is 20 A, less the current allocated
to the load circuit via the ‘VO Seq’ output.
The output voltage adjust range of the PTB78520W is
1.8 V to 3.6 V, which is compatible with the 3.3-V input
non-isolated POL modules. In these applications, the
PTB78520W output voltage must always be set to 3.3 V
(R1 =887). Note that this sets the output voltage of
both the ‘VO Bus’ and ‘VO Seq’ outputs. The 3.3-V input
non-isolated modules, U2 and U3, can be set to any volt-
age over the range, 0.8 V to 2.5 V. In this example they
are set to 2.5 V (R2 =2.21 k) and 1.8 V (R3 =5.49 k)
respectively. Figure 2-3 shows the power-up waveforms
from Figure 2-2 when the Track control input to all three
modules are simply connected together.
The PTB78520W provides input power to the down-
stream non-isolated modules via the ‘Vo Bus’ output.
This is the output that rises first to allow the down-
PTB78520W
stream modules to complete their power-up initialization.
‘VO Seq’ (3.3 V), and the outputs VPOL1 (2.5 V) and VPOL2
(1.8 V), supply the load circuit. These three outputs
are controlled by the track control voltage, which the
PTB78520W holds at ground potential for 20 ms after
the ‘VO Bus’ output is in regulation. When the track
control voltage is finally allowed to rise, the three outputs
rise simultaneously to their respective set-point voltages.
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| PTB78560A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:30-W, 24-V/48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK SEQUENCING |
| PTB78560AAH | 功能描述:DC/DC轉(zhuǎn)換器 30-W 24-V/48V Input DC/DC Converter RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTB78560AAS | 功能描述:DC/DC轉(zhuǎn)換器 30-W 24-V/48V Input DC/DC Converter RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTB78560AAZ | 功能描述:DC/DC轉(zhuǎn)換器 30-W 24-V/48V Input DC/DC Converter RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTB78560BAH | 功能描述:DC/DC轉(zhuǎn)換器 30-W 24-V/48V Input DC/DC Converter RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
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