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| 型号： | TPS65171RHAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件页数： | 26/46页 |
| 文件大小： | 3644K |
| 代理商： | TPS65171RHAR |
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ONE
s
ONE
D2
ONE
I
Power dissipation = 2
V
2
V
R
I
D
-
-
÷
è
2
resistor
ONE
P
= R12
I
logic
out
FB3
logic
V
R9
V
= V
+ (V
V
)
= 0.75
V
= 2.475V 0.825
R10
4
R10
-
-
logic
V
0.75
V
0.825 V
R10 =
=
10 k
80 A
-
W
m
out
logic
out
FB3
out
FB3
logic
V
0.75
V
2.475 V
R9 =
R10 =
R10
V
0.25
V
0.825 V
-
-
-
-
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
www.ti.com
The power dissipation of the transistor should be calculated for the maximum applied boost output voltage VS. If
high voltage stress mode (HVS) is used the maximum VS voltage occurs during HVS mode.:
(40)
As an example for Vs = 18V and IONE = 75mA, the power dissipation is approximately 0.5W.
Because of the 1mF collector capacitor C16 a wide range of transistors can be used. The most important
transistor parameters are Collector-Emitter voltage which must be at least 2 x VS , average current rating of 1.2 x
IONE and DC current gain hFE, which must be at least IONE / IBase2. IBase2 minimum value of 8mA should be used
for calculation. See Table 13 for possible transistor selection.
Table 13. Transistor Selection (Positive Charge Pump)
TRANSISTOR
PZT2907A
KTA1551T
KTA1718D
KTA1666
Resistor R12 Function and Power Dissipation (Positive Charge Pump)
R12 is used to limit the peak current flowing from collector capacitor C16 through R12, D3 and C15 into the
boost switching node. High peak currents disturb the boost converter switching which results in high VS and VONE
ripple. The power dissipation for the resistor R12 can be calculated by following formula:
(41)
Output Capacitor Selection (Positive Charge Pump)
For the best output voltage filtering, low ESR ceramic output capacitors are recommended. Two 4.7 mF ceramic
output capacitors with sufficient voltage rating are adequate for most applications. Additional capacitors can be
added to improve the load transient regulation. See Table 14 for capacitor selection.
Table 14. Output Capacitor Selection (Positive Charge Pump)
CAPACITOR
COMPONENT SUPPLIER
4.7mF/50V
Murata, GRM31CR71H475KA12
4.7mF/50V
Taiyo Yuden, UMK316BJ475KL-T
Negative Shunt Regulator (Vss)
Vss is a shunt regulator that regulates the non-addressed TFT pixels to the programmed voltage. The pulldown
resistor R11 connected to VOFFE is required to provide accurate no load current regulation. A minimum current of
50mA through the feedback divider provides good accuracy. Be aware of the negative value of Vss for the
calculations.
(42)
(43)
(44)
32
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65171
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