HA16121FP datasheet(7/34 Pages) RENESAS

Part #	HA16121FP

Description	Switching Regulator for Chopper Type DC/DC Converter

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Manufacturer	RENESAS [Renesas Technology Corp]

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7 / 34 page

HA16116FP/FPJ, HA16121FP/FPJ

Rev.2.0, Sep.18.2003, page 7 of 33

Determining External Component Constants (pin usage)

Constant settings are explained for the following items.

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

S.GND

CT

RT

IN(+)1

IN(

−)1

E/O1

DB1

CL1

OUT1

P.GND

S.VIN

Vref

TIM

ON/

OFF

IN(

−)2

E/O2

DB2

CL2

OUT2

P.VIN

1.

2.

3.

4.

5.

6.

7.

8.

Oscillator

frequency

(fOSC) setting

DC/DC converter

output voltage

setting and

error amp usage

Dead band duty

and soft start

setting

Output stage

circuit and

power MOS FET

driving method

Channel 1

Channel 2

Vref UVL and

OVP

Setting of inter-

mittent operation

timing when

overcurrent is

detected

ON/

OFF pin

usage

Overcurrent

detection value

setting

1. Oscillator Frequency (f

OSC) Setting

Figure 1.1 shows an equivalent circuit for the triangle wave oscillator.

VH

1.6 V typ

VL

1.0 V typ

t1

t2

1.1 V

1 : 2

CT

(external)

RT

(external)

RC

RB

RA

Vref (2.5 V)

CT charging

IO

Discharging

Comparator

(3.3 V

IC internal circuits)

Inside the IC

RT

CT

Figure 1.1 Equivalent Circuit for the Triangle Wave Oscillator

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HA16121FP Datasheet(PDF) 7 Page - Renesas Technology Corp

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