CPC1560GS datasheet(11/14 Pages) CLARE

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CPC1560

R00F

PRELIMINARY

5.6 Rise and Fall Times

The CPC1560 has rise and fall times that are primarily

limited by internal parasitic elements of the device; the

load components only play a secondary role. This can

be appreciated in the turn-off graph of an application

circuit operating at 45V, where the slope of the load

voltage starts scooping down into a more capacitive

shape after approximately 15 volts.

5.7 Over-Voltage Protection

5.7.1 Stored Energy in the Load

During the CPC1560’s switching periods, energy is

transferred between the load components, the

CPC1560 device, and, if used, the over-voltage

protection circuitry.

When the output switch turns off, inductive loads

(LLOAD) transfer their stored energy into the MOSFET

switches, the load capacitance, and the over-voltage

protector. (See the turn-off graph for a 45V inductive

load application circuit.)

When the output switch turns on, the energy in the

load inductor is zero, and the load capacitor (CLOAD)

must transfer its stored energy into the MOSFET.

Time (

μs)

-80

-40

-20

0.0

0.4

0.6

0.8

1.0

CPC1560

DC-Only Application Circuit

Resistive Load Turn-Off Characteristics

(Supply=45V

DC, RLOAD =75Ω)

0.2

-60

RISE=46μs

Time (

μs)

-80

-40

-20

0.0

0.4

0.6

0.8

1.0

CPC1560

DC-Only Application Circuit

Inductive Load Turn-Off Characteristics

(Supply=45V, R

LOAD =75Ω, LLOAD= 630μH)

0.2

-60

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