HA16341FP HITACHI [Hitachi Semiconductor], HA16341FP Datasheet - Page 16

• Manufacturer Part Number: HA16341FP
• Description: Redundant Secondary Switching Power Supply Controller
• Manufacturer: HITACHI [Hitachi Semiconductor]

HA16341NT/FP, HA16342NT/FP
Timing Chart 5 (External Trigger Control)
Rev.1, Jan. 2001, page 16 of 21
Primary IC
oscillation
Primary IC
AUX-OUT
Trigger input
(Trig terminal)
Trigger detector
internal signal
Secondary
oscillation
This IC is triggered by negative pulse.
R1 and R2 must be calculated including internal impedance of 230kΩ.
Trigger Vth
Vtrig: −0.5V typ
Primary IC
AUX-OUT
0V
0V
0V
0V
0V
Primary
Secondary
Figure B. External Trigger Application
R1
R2
Trig
230k
Vref (5V)
HA16341
Vth
CTH
= about 2.9V @CCT = 430pF