HA16120FP HITACHI [Hitachi Semiconductor], HA16120FP Datasheet - Page 18

• Manufacturer Part Number: HA16120FP
• Description: Switching Regulator for Chopper Type DC/DC Converter
• Manufacturer: HITACHI [Hitachi Semiconductor]

HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
7.4 Examples of Intermittent Mode Timing (calculated values)
18
(2) T
Example:
T
Here, coefficient
T = ln
from section 7.3 (2) previously.
OFF
OFF
2
(1) T
= T
T
Here, coefficient
T = 0.69
from section 7.3 (1) previously.
Example: If C
V
ON
ON
1
V
2
IN
IN
If C
R = 390 k , V
then
C
= T
A
ON/OFF
2V
V
ON/OFF
1
BE
T
BE
OFF
C
R = 2.2 k , and the on duty
of the current limiter is 75%,
then T
1
Figure 7.4 Examples of Intermittent Mode Timing (1)
Figure 7.5 Examples of Intermittent Mode Timing (2)
ON/OFF
B
= 55 ms.
= 2.2 F, R = 2.2 k ,
ON/OFF
(R + R )
On duty
ON
1
A
IN
= 13 ms.
= 12 V,
R
= 2.2 F,
B
B
B
T
0.05
2
0.1
0
0
T
1
8
6
4
2
0
0
10
20
(PWM) On duty (%)
V
IN
40
(V)
20
60
80
30
100
40