HA16114 Просмотр технического описания (PDF) - Renesas Electronics

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HA16114

Switching Regulator for Chopper Type DC/DC Converter

Renesas Electronics 

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 kΩ, 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 kΩ,

RA = 390 kΩ, 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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