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参数资料
| 型号： | PTH08T255WAD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | PLASTIC, MODULE-22 |
| 文件页数： | 18/34页 |
| 文件大小： | 4336K |
| 代理商： | PTH08T255WAD |
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Current Sharing and TurboTrans
www.ti.com ........................................................................................................................................................................................... SLTS290 – NOVEMBER 2008
Table 7. Required Connections for Current Sharing(1)
TERMINAL
MASTER
SLAVE
NAME
NO.
VI
6,7,14,15
Connect to the Input Bus.
VO
10,11
Connect to the Output Bus.
GND
8,9,12,13
Connect to Common Power GND.
Inhibit and
Use for Inhibit control & UVLO adjustments. If
21
No Connection. Leave open-circuit.
UVLO
unused leave open-circuit.
Use to set the output voltage. Connect RSET
Vo Adjust
18
No Connection. Leave open-circuit.
resistor between this pin and AGND (pin 4).
Connect to the output voltage either at the load or
+Sense
17
No Connection. Leave open-circuit.
at the module (pin 11).
Connect to the output GND either at the load or at
–Sense
16
No Connection. Leave open-circuit.
the module (pin 13).
Track
20
Connect to Track control or to VI (pin 15).
No Connection. Leave open-circuit.
Connect TurboTrans resistor, RTT, between this pin
TurboTrans
19
No Connection. Leave open-circuit.
and +Sense (pin 17).
Connect to an external clock. If unused connect to
SmartSync
22
Connect to Common Power GND.
GND.
CONFIG
1
Connect to GND. (2)
Connect to the Input Bus.
Share
2
Connect to pin 2 of Slave. (2)
Connect to pin 2 of Master.
Comp
3
Connect to pin 3 of Slave. (2)
Connect to pin 3 of Master.
AGND
4
Connect to pin 4 of Slave. (3)
Connect to pin 4 of Master.
CLKIO
5
Connect to pin 5 of Slave. (2)
Connect to pin 5 of Master.
(1)
For more details on the pin descriptions, please refer to the 'Terminal Functions' described in Table 1
(2)
See Layer A in Figure 22 for recommended layout
(3)
See Layer B in Figure 22 for recommended layout
When using TurboTrans while paralleling two modules, the TurboTrans resistor, RTT, must be connected from the
TurboTrans pin (pin 19) of the Master module to the +Sense pin (pin 17) of the Master module. When paralleling
modules the procedure to calculate the proper value of output capacitance and RTT is similar to that explained in
the TurboTrans Selection section, however the values must be calculated for a single module. Therefore, the
total output current load step must be halved before determining the required output capacitance and the RTT
value as explained in the TurboTrans Selection section. The value of output capacitance calculated is the
minimum required output capacitance per module and the value of RTT must be calculated using this value of
output capacitance. The TurboTrans pin of the Slave module must be left open.
As an example, let's look at a 12-V application requiring a 40 mV deviation during a 20 A load transient. A
majority of 470
F, 10 m output capacitors are used. Use the 12 V, Type B capacitor chart, Figure 7. First,
halving the load transient gives 10 A. Dividing 40 mV by 10 A gives 4 mV/A transient voltage deviation per amp
of transient load step. Select 4 mV/A on the Y-axis and read across to the 'With TurboTrans' plot. Following this
point down to the X-axis gives us a minimum required output capacitance of approximately 1800
F. This is the
minimum required output capacitance per module. Hence, the total minimum output capacitance would be 2 ×
1800
F = 3600 F. The required R
TT resistor value for 1800 F can then be calculated or selected from Table 4.
The required RTT resistor is approximately 26.7 k.
Copyright 2008, Texas Instruments Incorporated
25
Product Folder Link(s): PTH08T255W
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| PTH08T255WAS | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T255WAST | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T255WAZ | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T255WAZT | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T260W | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
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