TCM680 데이터 시트보기 (PDF) - Microchip Technology

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TCM680

+5V To ±10V Voltage Converter

Microchip Technology 

4.5 Maximum Operating Limits

The maximum input voltage rating must be observed.

The TCM680 will clamp the input voltage to 5.8V.

Exceeding this maximum threshold will cause exces-

sive current to flow through the TCM680, potentially

causing permanent damage to the device.

4.6 Switched Capacitor Converter

Power Losses

The overall power loss of a switched capacitor

converter is affected by four factors:

1. Losses from power consumed by the internal

oscillator, switch drive, etc. These losses will

vary with input voltage, temperature and

oscillator frequency.

2. Conduction losses in the non-ideal switches.

3. Losses due to the non-ideal nature of the

external capacitors.

4. Losses that occur during charge transfer from

the pump to reservoir capacitors when a voltage

difference between the capacitors exists.

The power loss for the TCM680 is calculated using the

following equation:

EQUATION

PLOSS = (IOUT+)2 X ROUT- + (IOUT-)2 X ROUT+ + IIN X VIN

TCM680

© 2005 Microchip Technology Inc.

DS21486C-page 7

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