參數(shù)資料
型號(hào)： LMK316BJ475KL
廠商： Texas Instruments, Inc.
英文描述： UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
中文描述： 未穩(wěn)壓60 mA充電泵電壓型逆變器
文件頁(yè)數(shù)： 16/23頁(yè)
文件大?。?/td> 430K
代理商： LMK316BJ475KL
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
combined doubler/inverter
In the circuit of Figure 27, capacitors C
I
, C
(fly)
, and C
O
form the inverter, while C1 and C2 form the doubler. C1
and C
(fly)
are the flying capacitors; C
O
and C2 are the output capacitors. Because both the inverter and doubler
use part of the charge-pump circuit, loading either output causes both outputs to decline toward GND. Make
sure the sum of the currents drawn from the two outputs does not exceed 60 mA. The maximum output current at
V
(pos)
must not exceed 30 mA. If the negative output is loaded, this current must be further reduced.
TPS60400
OUT
C1+
IN
C1
–
GND
1
2
3
5
4
C(fly)
1
μ
F
+
CO
1
μ
F
CI
1
μ
F
–
VI
GND
GND
VI
C1
+
+
D2
C2
+
V(pos)
+
I
I
≈
–
I
O
+ 2
×
I
O(POS)
Figure 27. TPS60400 as Doubler/Inverter
cascading devices
Two devices can be cascaded to produce an even larger negative voltage (see Figure 28). The unloaded output
voltage is normally
–
2
×
V
I
, but this is reduced slightly by the output resistance of the first device multiplied by the
quiescent current of the second. When cascading more than two devices, the output resistance rises
dramatically.
TPS60400
OUT
C1+
IN
C1
–
GND
1
2
3
5
4
C(fly)
1
μ
F
CO
1
μ
F
CI
1
μ
F
VO (
–
2 VI)
GND
VI
GND
TPS60400
OUT
C1+
IN
C1
–
GND
1
2
3
5
4
CO
1
μ
F
GND
+
+
+
C(fly)
1
μ
F
Figure 28. Doubling Inverter
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