M62215FP

REJ03D0844-0201 Rev.2.01 Nov 14, 2007

Page 8 of 10

[Operation description by mode]

Mode [I] …………Start-up

The potential of FB terminal goes down to the control state before that of SCP terminal goes to SCP terminal

"H" threshold voltage. (approx. 5 V)

Mode [II]…………Over-current

→ Latch

When the over current flows in the system and CLM terminal voltage goes up to CLM term. threshold

voltage, approximately 20

µA charge current flows out from SCP term.. This charge current makes the

potential of SCP term. high. Output will be off (latched) when the potential of SCP term. reaches SCP term.

"H" threshold voltage.

Mode [III] …………Latch canceled

→ restart

The latch is canceled and the system is restarted when the potential of FB terminal is set lower than FB term.

threshold voltage.

More [IV]…………Over-current

→ recovery

The potential of SCP term. goes up by over current. The output is not turned off, because the potential of FB

terminal goes down to lower than its threshold voltage before that of SCP term. reaches SCP term. "H"

threshold voltage and also the latch-state is canceled.

Mode [VI]…………Start-up

→ Latch

At the start-up, the output is turned off, because the potential of FB term. doesn’t go down to its threshold

voltage due to output short-circuit before the potential of SCP term. reaches SCP "H" threshold voltage.

+

−

CLM

200 mV

FB

4.2 V

5 V

TR1

SCP

R2

R1

SW1

20

µA

R

R

R

S

S

S

Q

Q

Q

OUT section

High signal

in fall rate of OSC

OUT section

Figure 6 Schematic Diagram of SCP Section