NCP1402_06 datasheet(15/18 Pages) ONSEMI

No de pièce	NCP1402

Description	200 mA, PFM Step?뭊p Micropower Switching Regulator

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NCP1402

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APPLICATIONS CIRCUIT INFORMATION

1

3

GND

CE

2

OUT

NC

4

LX

5

NCP1402

Figure 59. Typical Application Circuit

VOUT

C2

68

mF

D1

L1

47

mH

C1

10

mF

Vin

Step−up Converter Design Equations

NCP1402 step−up DC−DC converter designed to operate

in continuous conduction mode can be defined by:

Calculation

Equation

L

v M

Vin2

VOUT IOmax

IPK

(Vin * Vs)ton

L

) I min

Imin

(ton ) toff)IO

toff

*

(Vin * VS)ton

2L

toff

(Vin * Vs)ton

(VOUT ) VF * Vin)

DQ

(IL * IO)toff

Vripple

[ DQ

COUT

) (IL * IO)ESR

*NOTES:

IPK

− Peak inductor current

Imin

− Minimum inductor current

IO

− Desired dc output current

IOmax − Desired maximum dc output current

IL

− Average inductor current

Vin

− Nominal operating dc input voltage

VOUT − Desired dc output voltage

VF

− Diode forward voltage

VS

− Saturation voltage of the internal FET switch

DQ

− Charge stores in the COUT during charging up

Vripple − Output ripple voltage

ESR

− Equivalent series resistance of the output capacitor

M

− An empirical factor, when VOUT ≥ 3.0 V,

M = 8 x 10−6, otherwise M = 5.3 x 10−6.

EXTERNAL COMPONENT SELECTION

Inductor

The NCP1402 is designed to work well with a 47

mH

inductor in most applications. 47

mH is a sufficiently low

value to allow the use of a small surface mount coil, but large

enough to maintain low ripple. Low inductance values

supply higher output current, but also increase the ripple and

reduce efficiency. Note that values below 27

mH is not

recommended due to NCP1402 switch limitations. Higher

inductor values reduce ripple and improve efficiency, but

also limit output current.

The inductor should have small DCR, usually less than 1

W to minimize loss. It is necessary to choose an inductor with

saturation current greater than the peak current which the

inductor will encounter in the application.

Diode

The diode is the main source of loss in DC−DC converters.

The most importance parameters which affect their

efficiency are the forward voltage drop, VF, and the reverse

recovery time, trr. The forward voltage drop creates a loss

just by having a voltage across the device while a current

flowing through it. The reverse recovery time generates a

loss when the diode is reverse biased, and the current appears

to actually flow backwards through the diode due to the

minority carriers being swept from the P−N junction. A

Schottky diode with the following characteristics is

recommended:

Small forward voltage, VF < 0.3 V

Small reverse leakage current

Fast reverse recovery time/ switching speed

Rated current larger than peak inductor current,

Irated > IPK

Reverse voltage larger than output voltage,

Vreverse > VOUT

Input Capacitor

The input capacitor can stabilize the input voltage and

minimize peak current ripple from the source. The value of

the capacitor depends on the impedance of the input source

used. Small Equivalent Series Resistance (ESR) Tantalum or

ceramic capacitor with value of 10

mF should be suitable.

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NCP1402 Fiches technique(PDF) 15 Page - ON Semiconductor

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