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参数资料
| 型号： | TPS40070PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 8/28页 |
| 文件大小： | 655K |
| 代理商： | TPS40070PWPRG4 |
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BOOST AND DBP BYPASS CAPACITANCE
INTERNAL REGULATORS
25
5
10
20
15
30
4.10
4.00
4.05
4.15
4.20
4.35
4.25
4.30
4.40
4.45
4.50
INPUT VOLTAGE
vs
LOW VOLTAGE BYPASS VOLTAGE
VDD - Input Voltage - V
V
D
B
P
-
Low
V
oltage
Bypass
V
oltage
-
V
INPUT VOLTAGE
vs
DBP VOLTAGE
VDD - Input Voltage - V
V
D
B
P
-
Driver
Bypass
V
oltage
-
V
0
5
4
5
10
15
20
25
7
6
9
8
10
TPS4007x POWER DISSIPATION
P
D + Qg
V
DR
f
SW
(Watts driver)
(15)
SLUS582J – DECEMBER 2003 – REVISED APRIL 2009 .................................................................................................................................................. www.ti.com
The BOOST capacitance provides a local, low-impedance flying source for the high-side driver. The BOOST
capacitor should be a good quality, high-frequency capacitor. A capacitor with a minimum value of 100-nF is
suggested.
The DBP has to provide energy for both the synchronous MOSFET and the high-side MOSFET (via the BOOST
capacitor). The suggested value for this capacitor is 1-
F ceramic, minimum.
The internal regulators are linear regulators that provide controlled voltages for the drivers and the internal
circuitry to operate from. The DBP pin is connected to a nominal 8-V regulator that provides power for the driver
circuits to operate from. This regulator has two modes of operation. At VDD voltages below 8.5 V ,the regulator is
in a low dropout mode of operation and tries to provide as little impedance as possible from VDD to DBP. Above
10 V at VDD, the regulator regulates DBP to 8 V. Between these two voltages, the regulator remains in the state it
was in when VDD entered this region (see Figure 12). Small amounts of current can be drawn from this pin for
other circuit functions, as long as power dissipation in the controller device remains at acceptable levels and
junction temperature does not exceed 125C.
The LVBP pin is connected to another internal regulator that provides 4.2-V (nom) for the operation of
low-voltage circuitry in the controller. This pin can be used for other circuit purposes, but extreme care must be
taken to ensure that no extra noise is coupled onto this pin, since controller performance suffers. Current draw is
not to exceed 1 mA. See Figure 13 for typical output voltage at this pin.
Figure 12.
Figure 13.
The power dissipation in the TPS4007x is largely dependent on the MOSFET driver currents and the input
voltage. The driver current is proportional to the total gate charge, Qg, of the external MOSFETs. Driver power
(neglecting external gate resistance) can be calculated from:
where
V
DR is the driver output voltage
16
Copyright 2003–2009, Texas Instruments Incorporated
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| TPS40071PWPG4 | 功能描述:DC/DC 开关控制器 Mid Rg In Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40071PWPR | 功能描述:DC/DC 开关控制器 Mid Rg In Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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