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參數(shù)資料
| 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)： | 10/46頁 |
| 文件大?。?/td> | 3644K |
| 代理商： | TPS65171RHAR |
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_
log
22 (1
)
PG high
ic
out
V
R
A
I
m
=
-
+
DLY
th
5 A
DLY
5 A
DLY
C
=
, with DLY = Desired delay time
V
1.24 V
m
m
DLY
5
A
2.5 ms
C
=
= 10.1 nF
CDLY = 10 nF
1.24 V
m
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
www.ti.com
The resulting PG voltage if PG pin is high impedance is dependent on R22 connection voltage (Vlogic), R22 value
and output current Iout of PG node. The output current is flowing to the external scan driver. Assuming a
maximum switch leakage current of 1mA the minimum PG output voltage can be calculated as following:
(2)
Recommended are R22 values between 5k
and 500k. Typical value for R22 is 10k.
Setting the Delay Times DLY1, DLY2
Connecting an external capacitor to the DLY1 and DLY2 pins sets the delay time. The capacitor is charged with
a constant current source of typically 5mA. The delay time is terminated when the capacitor voltage has reached
the threshold voltage of Vth = 1.24V. If no capacitor is set, the delay time is zero. The external capacitors can be
calculated as follows:
(3)
Example for setting a delay time of 2.5ms:
(4)
Boost Converter
The non-synchronous current mode boost converter operates in Pulse Width Modulation (PWM) operation with a
fixed frequency of 750 kHz. For maximum flexibility and stability with different external components the converter
uses external loop compensation. At start up the boost converter starts with an externally adjustable soft-start.
The boost converter provides the supply voltage for the LCD source driver as well as for the charge pump
regulator VONE. This needs to be taken into account when defining the output current requirements for the boost
converter. No feed-forward capacitor is needed for proper operation.
18
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65171
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