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參數(shù)資料
| 型號： | TPS9104PT |
| 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)： | 29/33頁 |
| 文件大小： | 557K |
| 代理商： | TPS9104PT |
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TPS9104
CELLULAR SUBSCRIBER TERMINAL
POWER SUPPLY/AUDIO SYSTEM
SLVS133A – AUGUST 1996 – REVISED APRIL 1998
29
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
LDOs (VL, VA, VB) output capacitors
A 10-
μ
F capacitor must be tied to Cx (CL, CA, or CB). The Cx
terminal is connected internally to the output of
the LDO through a 1-
resistor. The stability of LDOs is dependent on the ESR of the output filter capacitor. Most
LDOs are designed to be stable over a narrow range of ESR with lower limits and upper limits, thus limiting the
type of capacitor that can be used. With the use of the internal 1-
resistor, the lower ESR limit of the capacitor
is eliminated, permitting the upper limit to be raised. Therefore, almost any tantalum or ceramic capacitor can
be used, provided the ESR does not exceed 15
over temperature.
charge pump design
C1
+
C2
VCP
CP
GND_CP
VO
a. Voltage Inverter
C1
C2
VCP
CP
GND_CP
VO
b. Voltage Doubler
VCC
VCC
+
Figure 44. Charge Pump Configurations
The charge-pump terminal can drive either a voltage inverter or a voltage doubler. In either case only two
capacitors and two signal diodes are needed. The output voltage is unregulated and a regulator may be added
if needed.
The charge transfer of C1 is:
q
C1
(VCC
VO)
This occurs f times a second and the charge transfer per unit time (current) is:
I
f
C1
(VCC
VO)
Rewriting this equation in the form of I = V/R
I
VCC
VO
1
f
C1
where
is an equivalent resistor.
1
f
C1
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