HA16141P/FP, HA16142P/FP

Rev.4, Sep. 2001, page 14 of 14

5. Integrator (OC detection operation)

PWM-RES

(internal signal)

O.C

(overcurrent

detection input)

TIM pin current

(integral output

current)

TIM pin voltage

(integral output

voltage)

LATCH STATUS

(for PFC-STOP)

LATCH STATUS

(for PWM-STOP)

0.3V

0

5.2

µA

−21µA

2.5V

0.2V

PFC Enable

PWM Enable

PFC Stop

3V

t-tim1

Note: Timer time calculation equation

Timer time t-tim1 is the time until PG pin inversion (from low to high) after the O.C pin trigger.

t-tim1 can be set using the following approximate equation.

t-tim1 =

−Ctim ⋅ (Vlch − pfc − 0.2V) / Isrc − tim1

=

−Ctim ⋅ (2.5V − 0.2V) / (−21µA) ⋅ ⋅ ⋅ ⋅ ⋅ Typical calculation