HA16114 データシートの表示（PDF） - Renesas Electronics

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HA16114

Switching Regulator for Chopper Type DC/DC Converter

Renesas Electronics 

HA16116FP/FPJ, HA16121FP/FPJ

Overcurrent Detection Value Setting

The overcurrent detection value VTH for this IC series is 0.2 V (Typ) and the bias current is 200 µA (Typ)

The power MOS FET peak current value before the current limiter goes into operation is derived from the

following equation.

ID =

VTCL − (RF + RCS) ⋅ IBCL

RCS

Here VTH = VIN – VCL = 0.2 V, VCL is a voltage referd on GND.

Note that CF and RCS form a low-pass filter, determined by their time constants, that prevents malfunctions

from current spikes when the power MOS FET is turned on or off.

S.VIN

To other

circuitry

1k

200 µA

CF 1800 PF

VCL

IBCL

CL

RF

240 Ω

RCS

0.05 Ω

OUT

Detection

output

(internal)

−+

IN(−)

G

S

D

+

−

VIN

This circuit is an example

for step-down output use.

VO

Figure 8.1 Example for Step-Down Use

The sample values given in this figure are calculated from the following equation.

ID =

0.2 V − (240 Ω + 0.05 Ω) × 200 µA

0.05 Ω

= 3.04 [A]

The filter cutoff frequency is calculated as follows.

1

1

fC =

2π CF RF

=

6.28 × 1800 pF × 240 Ω

= 370 [kHz]

Rev.2.0, Sep.18.2003, page 20 of 33

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