Voltage Inverter With Cascade Stage.pdf

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050

Voltage Inverter with Cascade Stage

The circuit diagram shows a switched-capacitor voltage

inverter with +5-V input and –3-V output, along with a sup-

plementary cascade stage to generate a +17-V auxiliary volt-

age. The capacitor connected to the CP– and CP+ terminals

assists in inverting the input voltage. During the first clock

phase it is charged to the input voltage, while during the sec-

ond clock phase its positive terminal is connected to ground

while its other terminal is connected to the output. This gen-

88

Elektor Electronics

12/2002

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SMALL CIRCUITS COLLECTION

erates a negative voltage at the output, with an amplitude

equal to the input voltage. Using the duty cycle, the IC

described here generates a regulated output voltage of –3 V

with a current capacity of 120 mA.

The clocked operation makes it possible to connect an addi-

tional diode cascade stage for voltage multiplication. This con-

sists of a series of diodes (for instance, type SS24 SMD Schot-

tky diodes) with alternating pump and storage capacitors. The

pump capacitors are connected to CP+ and charge when CP+

is at ground potential. When CP+ goes to a high-potential

level, the potentials on the upper plates of the pump capaci-

tors are pushed up. Each pump capacitor then discharges into

the following storage capacitor (connected to ground) via the

intermediate diode. The voltage increases with each pump

stage, resulting in a net voltage of around +17 V after three

voltage boosts, with a maximum load capacity of 3 mA.

The type ADP3605 IC is available from Analog Devices

( www.analog.com/productSelection/pdf/ADP3605_a.pdf ) and

is housed in an SO8 SMD package. A High level (> +2.4 V)

C3

C5

C7

2

µ

2

16V

1

µ

16V

1

µ

16V

+5V

+17V

D1

D2

D3

D4

D5

D6

3mA

C1

C4

C6

8

VIN

1 µ

2

µ

2

10V

1

µ

16V

1

CP+

C2

IC1

–3V

2

µ

2

3

7

CP–

VOUT

ADP3605

120mA

SHUTDOWN

4

SD

R1

VSENSE

D1...D6 = SS24

C9

2

5

2

µ

2

024091 - 11

can be applied to the Shutdown input (SD) to disable the

converter.

(024091-1)

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