HA16341FP HITACHI [Hitachi Semiconductor], HA16341FP Datasheet - Page 15

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

Timing Chart 4 (Soft Start)
CT
SS
OUT
(PWM)
Note: Self-oscillation: Vth
Vth
Vth
Synchronized operation: Vth
Case V
Case V
Please refer to formula 1 as design value of maximum duty.
Max duty = (tss − 0.63µs − Td1) × Operating frequency ⋅ ⋅ ⋅ ⋅ ⋅ Formula 1
tss =
Select values R1, R2 and C1 for suitable maximum duty and SS time constant.
Maximum duty would be the value specified in page 9.
Maximum duty decrease to the corresponding value.
CTH
CTL
Note *
: 3.4V
: 1.3V
C
Ici
HSS
HSS
CT
Ici
C
Vth
Vth
SS
(V
≥ Vth
< Vth
CT
HSS
CTH
CTL
CTH
CTH
− Vth
C
: CT charge current
: CT terminal capacitor
: CT upper trip point
: CT lower trip point
CTH
R1 + R2
C1
R1 R2
CTL
= 3.4V typ
)
CTH
Figure A. SS Terminal Application
CT
R1
R2
= 2.9V typ
Vref (5V)
SS
HA16341
HA16341NT/FP, HA16342NT/FP
VHSS =
R1 + R2
R2
Rev.1, Jan. 2001, page 15 of 21
Vref (5V)
SS