M62212P データシートの表示（PDF） - Renesas Electronics

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M62212P

General Purpose DC/DC Converter

Renesas Electronics 

M62212P/FP/GP

Constant Definition

Constant

TON

TOFF

TON + TOFF

TOFF (MIN)

TON (MAX)

D (MAX)

COSC

L (MIN) *1

R1 *2, *3

RDTC *4

Not use short

protection

Use short

protection

CDTC *4

Calculate from

start-up time

Calculate from

shat down time

Step-down Circuit

VO + VF

VIN − VCE (sat) − VO

1

fosc

TON + TOFF

1+

TON

TOFF

1

fosc

− TOFF

TON (MAX)

TON + TOFF

1

75 × 103 × fosc − 16 × 10−12

(VIN − VCE (sat) − VO) × TON (MAX)

∆IO

VO

VREF

−1

× R2

VDTC (MAX)

ICH1

VDTC (MAX)

ICH2

ICH1 × tstart

VDTC (MAX)

IDIS1 × tshort

VDTC (MAX) − VOSCL

Step-up Circuit

VO + VF − VIN

VIN − VCE (sat)

1

fosc

TON + TOFF

1+

TON

TOFF

1

fosc

− TOFF

TON (MAX)

TON + TOFF

1

75 × 103 × fosc − 16 × 10−12

(VIN − VCE (sat) )2 × TON (MAX)2 × fosc

2 × VO × IO

VO

VREF

−1

× R2

VDTC (MAX)

ICH1

VDTC (MAX)

ICH2

ICH1 × tstart

VDTC (MAX)

IDIS1 × tshort

VDTC (MAX) − VOSCL

Inverse Polarity Circuit

VO + VF

VIN − VCE (sat)

1

fosc

TON + TOFF

1+

TON

TOFF

1

fosc

− TOFF

TON (MAX)

TON + TOFF

1

75 × 103 × fosc − 16 × 10−12

(VIN − VCE (sat) )2 × TON (MAX)2 × fosc

2 × VO × IO

VO

VREF

−1

× R2

VDTC (MAX)

ICH1

VDTC (MAX)

ICH2

ICH1 × tstart

VDTC (MAX)

IDIS1 × tshort

VDTC (MAX) − VOSCL

note: VF: Forward voltage of outer diode.

VCE (sat): Saturation voltage of M62212 or saturation voltage of current buffer transistor

Please setting the oscillation frequency first and calculate each constant value.

1. Please setting ∆IO about 1/3 to 1/5 of maximum output current

2.

|VO| = (1 +

R1

R2

) × VREF

3. Please setting R2 about few kΩ to score fo kΩ because output voltage don’t undergo a influence of input

current (Terminal 7)

4. Please setting VDTC (MAX) to satisfy D (MAX), fixed from characteristics of D (MAX) − VDTC (MAX). ICH1 means DTC

charge current when start-up (−45 µA typ), ICH2 means DTC charge current when stable state (−10 µA typ),

VOSCL means lower limit voltage of oscillation waveform (0.45 V typ), and IDIS1 means DTC discharge current

1 (50 µA typ).

tstart means time interval when terminal voltage of DTC increase to VOSCL from lower voltage and to start

switching at first.

tshort means time interval when output is shut down after output is shorted

Rev.2.00 Jun 14, 2006 page 7 of 8

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