HA16108FP HITACHI [Hitachi Semiconductor], HA16108FP Datasheet - Page 6

• Manufacturer Part Number: HA16108FP
• Description: PWM Switching Regulator for High-performance Voltage Mode Control
• Manufacturer: HITACHI [Hitachi Semiconductor]

HA16107P/FP, HA16108P/FP
Function and Timing Chart
Triangle Waveform and PWM Output
6
Note: When f
Timing chart (during normal operation)
Oscillator equivalent circuit
E/O
C
V
OUT
RT2
T
Determine the correct constants after constructing a test circuit.
R
T1
I
I
1
2
2
6
=
=
OSC
I
1
Vref
Vref
0 V
0 V
V
C
2V
IN
is high, the actual value will differ from that given by the formula due to the delay time.
T
I
R
1
R
BE
7
T1
T2
2V
2V
2
2
BE
BE
V
2I
The 2s are transistors whose emitter area is doubled.
TH
2
4.2 V typ
t
t
DB
ON
2
R
=
T2
t
Dead band
C
DB
Vref
V
T
9
8
TL
t
2R
DB
V
I
R
2
RT2
2.2 V typ
T1
T1
2V
R
T2
BE
2V
R
T2
(s)
t
ON
0.4
0.6 V
C
T
R
T1
+
+
Vref
(connected internally)
(s)
Comparator for
triangle waveform
oscillation
Du max =
f
OSC
Triangle waveform
is output to C
1
t
DB
2R
Du max
R
T2
T1
T
pin
(Hz)