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| 型號： | TPS65171RHAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件頁數(shù)： | 25/46頁 |
| 文件大小： | 3644K |
| 代理商： | TPS65171RHAR |
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out
FB4
R14
V
= V
1+
= 1.24 V
1+
R15
÷
÷
è
è
F B4
V
1.24V
R15 =
=
2.4 k
500
A
500
A
W
m
out
FB4
V
R14 = R15
1
= R 15
1
V
1.24 V
-
-
÷
÷
è
è
1
C17 =
2
12 kHz
R14
p
ONE
D1
D2
Q
I
V
= 2
Vs + V
2
V
R
V
D
-
-
-
www.ti.com
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
Setting the Output Voltage and Selecting the Feed-Forward Capacitor (Positive Charge Pump)
To minimize noise a minimum current through the feedback divider of 500 mA is recommended. At startup the
device is in short circuit mode with reduced current (typ. 50 mA) until the feedback voltage FB4 exceeds 100 mV,
then the device switches to soft-start mode until the output voltage VONE is in regulation. Due to the high output
current and low required voltage drop, high current Schottky diodes with low forward voltage are recommended
for this regulator.
(35)
(36)
(37)
To minimize noise and leakage current sensitivity keep the lower feedback divider resistor R15 between 100
and 4.7k
. See typical application section for charge pump circuit.
Across the upper feedback resistor R14, a bypass capacitor C17 is required. The capacitor is calculated as:
(38)
Figure 31. Positive Chargepump Block Diagram
PNP Transistor Selection (Positive Charge Pump)
The maximum possible VONE output voltage is calculated as:
(39)
With:
Vs = boost converter output voltage
VD1 = Forward voltage of boost converter Schottky diode
VD2 = Forward voltage of charge pump diode for a current of IONE / D
IONE = VONE output current
D = Duty cycle of boost converter (D = 1 – Vin / Vs)
R = Series resistor (if applicable, e.g., 2
for typical application)
VQ = Transistor saturation voltage
As a general recommendation the VONE voltage level in use should be at least 0.5V lower than the calculated
maximum VONE voltage.
Copyright 2009–2010, Texas Instruments Incorporated
31
Product Folder Link(s): TPS65171
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