參數(shù)資料
型號(hào)： PTB78560AAH
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, DIP-11
文件頁(yè)數(shù)： 10/27頁(yè)
文件大?。?/td> 643K
代理商： PTB78560AAH
www.ti.com
Supply
Supervisor
20 ms
Delay
+ Sense
Track
Smart Sense
To Internal
Error
Amplifier
RTRK
24.9 k
VO Bus
VO Seq
CTRK
1
F
VO COM
Note: Shaded functions are available only with the PTB78560B (3.3V output)
Notes:
Power-Up Sequencing With A VO SEQ Output (PTB78560B)
SLTS249 – JUNE 2005
Figure 26. Block Diagram of Auto-Track Features
1. Auto-Track compatible modules incorporate a Track input that can take direct control of the output voltage
during power-up transistions. The control relationship is on a volt-for-volt basis and is active between the 0 V
and the module set-point voltage. Once the Track input is above the set-point voltage, the module remains at
its set-point. Connecting the Track input of a number of such modules together allows their outputs to follow
a common control voltage during power up.
2. When +Sense is connected to the V
OSeq output of the PTB78560B, the VOSeq output is tightly regulated to
the set-point voltage. In this configuration, the voltage at the V
OBus output is up to 100 mV higher.
3. The V
OSeq output on the PTB78560B cannot sink load current. This constraint does not allow the module to
coordinate a sequenced power down.
4. The slew rate for the Track input signal must be between 0.1 V/ms and 1 V/ms. Above this range, the V
OSeq
output may no longer accurately follow the Track input voltage. A slew rate below this range may thermally
stress the converter. These slew rate limits are automatically met whenever the Track voltage is controlled by
the internal R-C time constant of the modules being sequenced.
5. If an external voltage is used to control the Track terminal, the source current must be limited. A resistance
value of 2.74-k
is recommended for this purpose. This is necessary to protect the internal transistor to the
converter. This transistor holds the track control voltage at ground potential for at least 20 ms after the V
OBus
output is in regulation.
Figure 28 shows the PTB78560B converter (U1) providing two 3.3-V sources. This allows it to both power and
sequence with one or more downstream nonisolated modules. The example shows two 3.3-V input PTH04000W
modules (U2 and U3), each rated for up to 3 A of output current. The selection and current rating of the
nonisolated modules depends on the requirements of a specific application. The number of modules, their
respective output voltage, and load current rating combine with the load required at the VOSeq output. The total
must be supplied by the PTB78560B, and cannot exceed that available at the VOBus output.
The output voltage adjust range of the PTB78560B is 1.8 V to 3.6 V. In these applications, the output voltage
18
相關(guān)PDF資料
PDF描述
PTB78560CAS 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB78560BAZ 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB78560BAH 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB78560CAZ 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
PTB78560AAZ 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE
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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(biāo)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(fēng)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(biāo)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(fēng)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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTB78560BAS 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTB78560BAZ 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
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