M62220FP 查看數據表（PDF） - Renesas Electronics

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M62220FP

3.3 V Fixed Output Voltage DC/DC Converter

Renesas Electronics 

M62220L/FP

Application Circuit (3.3 V Output DC/DC Converter)

VIN (5 V)

+

100 µF

VOUT (3.3 V, 1 A)

+

100 µF

5 IN

RCLM

0.1 Ω

4

VCC

M62220

3

CLM

1 kΩ

Collector 1

1 kΩ

GND

2

47 µH

Figure 1 Example of the M62220L/FP Application Circuit

• Current limit detection:

When the voltage drop between pin 3 and pin 4 becomes more than 150 mV, the current limit detection circuit

begins operating. The peak switch current "Ipk" is limited to 150 mV/RCLM. In the example of application

(Figure 1), the current is limited to 1.5 A.

The Expression of Circuit Constants

Constants

TON

TOFF

(TON + TOFF) MAX

TOFF (MIN)

TON (MAX)

L (MIN)

lpk

RCLM

Expressions

VO + VF

VIN − VCE (sat) − VO

1

fOSC

fOSC: 110 kHz (VCC = 5 V)

(TON + TOFF) / ( 1 +

TON )

TOFF

1

fOSC

− TOFF

(VIN − VCE (sat) − VO) × TON (MAX)

∆lO

lO +

1

2

∆lO

0.15

Ipk

∆VCLM: 150 mV (VCC = 5 V)

Note:

VF: Forward voltage drop of an external diode.

Vsat: Output saturation voltage of an external switching transistor.

∆IO: It should be set between 1/3 and 1/5 of maximum output current.

An external transistor, diode and inductor should have a peak current capability of greater than "Ipk".

REJ03D0846-0300 Rev.3.00 Jun 15, 2007

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