TCM680 데이터 시트보기 (PDF) - Microchip Technology

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TCM680

+5V To ±10V Voltage Converter

Microchip Technology 

TCM680

4.0 DETAILED DESCRIPTION

4.1 VOUT- Charge Storage - Phase 1

The positive side of capacitors C1 and C2 are con-

nected to +5V at the start of this phase. C1+ is then

switched to ground and the charge in C1– is transferred

to C2–. Since C2+ is connected to +5V, the voltage

potential across capacitor C2 is now 10V.

SW1

+

– C1

SW2

VIN = +5V

SW3

+

– C2

SW4

–

C4

+

VOUT+

VOUT-

–

C3

+

-5V

FIGURE 4-1:

Charge Pump - Phase 1.

4.2 VOUT- Transfer - Phase 2

Phase two of the clock connects the negative terminal

of C2 to the VOUT- storage capacitor C3 and the positive

terminal of C2 to ground, transferring the generated

-10V to C3. Simultaneously, the positive side of capac-

itor C1 is switched to +5V and the negative side is

connected to ground.

+5V

SW1

+

– C1

SW2

SW3

+

– C2

SW4

–

C4

+

VOUT+

VOUT-

–

C3

+

-5V

-10V

FIGURE 4-2:

Charge Pump - Phase 2.

4.3 VOUT+ Charge Storage - Phase 3

The third phase of the clock is identical to the first

phase – the charge stored in C1 produces -5V in the

negative terminal of C1, which is applied to the negative

side of capacitor C2. Since C2+ is at +5V, the voltage

potential across C2 is 10V.

SW1

+

– C1

SW2

VIN = +5V

SW3

+

– C2

SW4

–

C4

+

VOUT+

VOUT-

–

C3

+

-5V

FIGURE 4-3:

Charge Pump - Phase 3.

4.4 VOUT+ Transfer - Phase 4

The fourth phase of the clock connects the negative

terminal of C2 to ground and transfers the generated

10V across C2 to C4, the VOUT+ storage capacitor.

Simultaneously, the positive side of capacitor C1 is

switched to +5V and the negative side is connected to

ground, and the cycle begins again.

SW1 SW3

+

+

– C1

–

SW2 SW4

-5V

+5V

–

C4

+

VOUT+

VOUT-

C2

–

C3

+

-10V

FIGURE 4-4:

Charge Pump - Phase 4.

DS21486C-page 6

© 2005 Microchip Technology Inc.

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