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参数资料
| 型号： | TPS65148RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 8/30页 |
| 文件大小： | 947K |
| 代理商： | TPS65148RHBR |
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2. V
S
C22
470nF
D8
3.V
S
T2
BC850B
V
~32V/20mA
GH
R15
4.3kW
C21
1 F/
50V
m
D7
BZX84C
33V
C23
470nF
D9
D5
D6
V
S
13.6V/500mA
D1
Q1
V
2.5Vto6V
IN
C19
470nF
L
C20
470nF
BAT54S
SLVS904A – MAY 2009 – REVISED JANUARY 2011
www.ti.com
EXTERNAL CHARGE PUMPS
External Positive Charge Pump
The external positive charge pump provides with the below configuration (figure Figure 20) an output voltage VGH
of maximum 3 times the output voltage of the Boost converter VS. The first stage provides roughly 3*VS in that
configuration, and the second stage is used as regulation whose output voltage is selectable. The operation of
the charge pump driver can be understood best with Figure 20 which shows an extract of the positive charge
pump driver circuit out of the typical application. The voltage on the collector of the bipolar transistor is slightly
equal to 3*VS–4*VF. The next stage regulates the output voltage VGH. A Zener diode clamps the voltage at the
desired output value and a bipolar transistor is used to provide better load regulation as well as to reduce the
quiescent current. Finally the output voltage on VGH will be equal to VZ–Vbe.
Figure 20. Positive Charge Pump
Doubler Mode: if the VGH voltage can be reached using doubler mode, then the configuration is the same than
the one shown in Figure 28.
External Negative Charge Pump
The external negative charge pump works also with two stages (charge pump and regulation). The charge pump
provides a negative regulated output voltage. Figure 21 shows the operation details of the negative charge
pump. With the first stage, the voltage on the collector of the bipolar transistor is equal to –VS+VF .
The next stage regulates the output voltage VGL. A resistor and a Zener diode are used to clamp the voltage to
the desired output value. The bipolar transistor is used to provide better load regulation as well as to reduce the
quiescent current. The output voltage on VGL will be equal to -VZ–Vbe.
16
Copyright 2009–2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS65148
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