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| 型號： | TPS65170RHDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-28 |
| 文件頁數(shù)： | 13/35頁 |
| 文件大?。?/td> | 4698K |
| 代理商： | TPS65170RHDT |
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1
GH
REF
2
R
V
= V
1 +
R
÷
è
OU T
1
2
R EF
V
R
= R
1
V
-
÷
è
SLVSA27 – OCTOBER 2009
www.ti.com
Figure 27. Positive Charge Pump Internal Block Diagram
Figure 28. Positive Charge Pump Application Circuit
POSITIVE CHARGE PUMP DESIGN PROCEDURE
Setting the Output Voltage (Positive Charge Pump)
The positive charge pump's output voltage is programmed by a resistor divider according to Equation 17.
(17)
Where VREF is the TPS65170's internal 1.24V reference.
Rearranging Equation 17, the values of R1 and R2 can be easily calculated:
(18)
A current of the order of 1mA through the resistor network ensures good accuracy and increases the circuit's
immunity to noise. It also ensures a minimum load on the charge pump, which reduces output voltage ripple
under no-load conditions. A good approach is to assume a value of about 1.2k
Ω for the lower resistor (R2) and
then select the upper resistor (R1) to set the desired output voltage.
Note that the maximum voltage in an application is determined by the boost converter's output voltage and the
voltage drop across the diodes and PNP transistor. For a typical application in which the positive charge pump is
configured as a voltage doubler, the maximum output voltage is given by Equation 19.
20
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS65170
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