參數(shù)資料
型號: TPS9104Y
廠商: Texas Instruments, Inc.
英文描述: CELLULAR SUBSCRIBER TERMINAL POWER SUPPLY/AUDIO SYSTEM
中文描述: 移動用戶終端電源/音頻系統(tǒng)
文件頁數(shù): 30/33頁
文件大?。?/td> 557K
代理商: TPS9104Y
TPS9104
CELLULAR SUBSCRIBER TERMINAL
POWER SUPPLY/AUDIO SYSTEM
SLVS133A – AUGUST 1996 – REVISED APRIL 1998
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
charge pump design (continued)
An equivalent circuit can now be drawn taking the diodes into account.
Rinternal
Requiv
+
C2
–(VCC –Vdiode)
a. Voltage Inverter
Rinternal
Requiv
+
C2
2VCC –Vdiode
b. Voltage Doubler
Figure 45. Equivalent Circuit
The output voltage for the doubler is then:
VO
2
VCC
2
Vdiode
IO
Rtotal
and the output voltage for the inverter is:
VO
(VCC
2
Vdiode)
IO
Rtotal
To determine the size of C1 use
C
I
f
V
where f = 100,000 and
V = ripple voltage.
For an output current of 10 mA calculate
C1
0.01 A
100 kHz
0.1 Vripple
1
F
Because of losses caused by diode switching and ESR, the calculated capacitance should be multiplied by 1.5
to 2. A 2-
μ
F capacitance should drive a 10-mA voltage doubler or inverter.
amplifier design
_
+
–1
SPKR_IN
or RNGR_IN
SPKR_OUT–
or RNGR_OUT–
TPS9104
SPKR_OUT+
or RNGR_OUT+
Speaker
AREF
C2
0.1
μ
F
Audio In
C1
R1
R2
Figure 46. Speaker and Ringer Amplifiers
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