參數(shù)資料
型號： TC682EPA
廠商： TelCom Semiconductor, Inc.
英文描述： INVERTING VOLTAGE DOUBLER
中文描述： 反向電壓倍增
文件頁數(shù)： 3/6頁
文件大小： 80K
代理商： TC682EPA
4-23
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
Phase 2
V
SS
transfer – phase two of the clock connects the
negative terminal of C
2
to the negative side of reservoir
capacitor C
3
and the positive terminal of C
2
to ground,
transferring the generated – 10V to C
3
. Simultaneously, the
positive side of capacitor C
1
is switched to +5V and the
negative side is connected to ground. C
2
is then switched to
V
CC
and GND and Phase 1 begins again.
Figure 3. Charge Pump – Phase 2
DETAILED DESCRIPTION
Phase 1
V
SS
charge storage – before this phase of the clock
cycle, capacitor C
1
is already charged to +5V. C
1
switched to ground and the charge in C
1
. Since C
2
C
2
is now –10V.
+
is then
–
is transferred to C
2
–
+
is at +5V, the voltage potential across capacitor
Figure 2. Charge Pump – Phase 1
MAXIMUM OPERATING LIMITS
The TC682 has on-chip zener diodes that clamp V
IN
to
approximately 5.8V, and V
–
maximum supply voltage or excessive current will be shunted
by these diodes, potentially damaging the chip. The TC682
will operate over the entire operating temperature range with
an input voltage of 2V to 5.5V.
OUT
to – 11.6V. Never exceed the
EFFICIENCY CONSIDERATIONS
Theoretically a charge pump voltage multiplier can
approach 100% efficiency under the following conditions:
The charge pump switches have virtually no offset
and are extremely low on resistance.
Minimal power is consumed by the drive circuitry
The impedances of the reservoir and pump capaci-
tors are negligible.
For the TC682, efficiency is as shown below:
Voltage Efficiency = V
OUT
/ (– 2V
IN
)
V
OUT
= – 2V
IN
+ V
DROP
V
DROP
= (I
OUT
) (R
OUT
)
Power Loss = I
OUT
(V
DROP
)
There will be a substantial voltage difference between
OUT
and 2 V
IN
if the impedances of the pump capacitors
C
1
and C
2
are high with respect to their respective output
loads.
Larger values of reservoir capacitor C
3
will reduce
output ripple. Larger values of both pump and reservoir
capacitors improve the efficiency. See "Capacitor Selec-
tion" in Applications section.
V
–
APPLICATIONS
Negative Doubling Converter
The most common application of the TC682 is as a
charge pump voltage converter which provides a negative
output of two times a positive input voltage (Figure 4).
Figure 4. Inverting Voltage Doubler
V
IN
= +5V
V
OUT
–5V
SW4
SW1
SW2
SW3
C
2
C
3
C
1
+
–
+
+
–
–
+5V
V
OUT
–10V
SW4
SW2
SW1
SW3
C
2
C
3
C
1
+
–
+
+
–
–
C
1
+
C
1
C
2
C
3
22
μ
F
C
2
+
V
IN
V
IN
V
OUT
GND
GND
TC682
22
μ
F
22
μ
F
7
6
5
4
3
2
1
V
OUT
C
2
–
C
1
–
INVERTING VOLTAGE DOUBLER
TC682
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