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HA16114 View Datasheet(PDF) - Renesas Electronics

Part NameDescriptionManufacturer
HA16114 Switching Regulator for Chopper Type DC/DC Converter Renesas
Renesas Electronics Renesas
HA16114 Datasheet PDF : 34 Pages
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HA16116FP/FPJ, HA16121FP/FPJ
6.4 Examples of Intermittent Operation Timing (calculated values)
(1) TON
TON = T1 × CON/OFF × RB
Here, coefficient
T1 = 0.4 ×
1
1 On duty
from section 6.3 (1) previously.
Example: If CON/OFF = 2.2 µF,
RB = 4.7 k, and the on duty
of the current limiter is 75%,
then TON = 16 ms.
4
3
2
T1
1
0
0
20 40 60 80 100
(PWM) ON Duty (%)
Figure 6.4 Examples of Intermittent Operation Timing (1)
(2) TOFF
TOFF = T2 × CON/OFF × (RA + RB)
Here, coefficient
T2 = ln
VIN
VIN
2VBE
3VBE
from section 6.3 (2) previously.
0.1
T2
0.05
Example: If CON/OFF = 2.2 µF, RB = 4.7 k,
RA = 390 k, VIN = 12 V,
then TOFF = 60 ms.
0
0
10
20
30
40
VIN (V)
Figure 6.5 Examples of Intermittent Operation Timing (2)
Rev.2.0, Sep.18.2003, page 17 of 33
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