MSS7341 datasheet(19/38 Pages) MICROCHIP

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DS25004A-page 19

MCP16301

5.7

Freewheeling Diode

The freewheeling diode creates a path for inductor cur-

rent flow after the internal switch is turned off. The aver-

age diode current is dependent upon output load

current at duty cycle (D). The efficiency of the converter

is a function of the forward drop and speed of the free-

wheeling diode. A low forward drop Schottky diode is

recommended. The current rating and voltage rating of

the diode is application dependent. The diode voltage

rating should be a minimum of VIN, plus margin. For

example, a diode rating of 40V should be used for an

application with a maximum input of 30V. The average

diode current can be calculated using Equation 5-6.

EQUATION 5-6:

DIODE AVERAGE

CURRENT

EXAMPLE 5-4:

A 0.5A to 1A diode is recommended.

5.8

Boost Diode

The boost diode is used to provide a charging path from

the low voltage gate drive source, while the switch

node is low. The boost diode blocks the high voltage of

the switch node from feeding back into the output volt-

age when the switch is turned on, forcing the switch

node high.

A standard 1N4148 ultra-fast diode is recommended

for its recovery speed, high voltage blocking capability,

availability and cost. The voltage rating required for the

boost diode is VIN.

For low boost voltage applications, a small Schottky

diode with the appropriately rated voltage can be used

to lower the forward drop, increasing the boost supply

for gate drive.

TABLE 5-3:

MCP16301 RECOMMENDED

3.3V INDUCTORS

Part Number

Size

WxLxH

(mm)

Coilcraft®

ME3220

0.52

0.90

3.2x2.521.0

LPS4414

0.440

0.92

4.3x4.3x1.4

LPS6235

0.125

2.00

6.0x6.0x3.5

MSS6132

0.135

1.56

6.1x6.1x3.2

MSS7341

0.057

1.78

7.3x7.3x4.1

ME3220

0.520

0.8

2.8x3.2x2.0

XFL2006

2.02

0.25

2.0x2.0x0.6

LPS3015

0.700

0.61

3.0x3.0x1.4

Wurth Elektronik®

744028

0.750

0.35

2.8x2.8x1.1

744029

0.600

0.42

2.8x2.8x1.35

744025

0.400 0.900

2.8x2.8x2.8

744031

0.255 0.450 3.8x3.8x1.65

744042

0.175

0.75

4.8x4.8x1.8

Coiltronics®

SD12

0.48

0.692

5.2x5.2x1.2

SD18

0.266 0.831

5.2x5.2x1.8

SD20

0.193 0.718

5.2x5.2x2.0

SD3118

0.51

0.75

3.2x3.2x1.8

SD52

0.189

0.88

5.2x5.5.2.0

Sumida®

CDPH4D19F

0.075

0.66

5.2x5.2x2.0

CDRH2D09C

0.52

0.24

3.2x3.2x1.0

CDRH2D162D

0.198

0.35

3.2x3.2x1.8

CDRH3D161H

0.328

0.65

4.0x4.0x1.8

TDK - EPC®

VLF3012A

0.54

0.41

2.8x2.6x1.2

VLF30251

0.5

0.47

2.5x3.0x1.2

VLF4012A

0.46

0.63

3.5x3.7x1.2

VLF5014A

0.28

0.97

4.5x4.7x1.4

B82462G4332M

0.097

1.05

6x6x2.2

TABLE 5-4:

FREEWHEELING DIODES

App

Manufacturer

Part

Number

Rating

12 VIN

600 mA

Diodes

Inc.

DFLS120L-7

20V, 1A

24 VIN

100 mA

Diodes

Inc.

B0540Ws-7

40V, 0.5A

18 VIN

600 mA

Diodes

Inc.

B130L-13-F

30V, 1A

D1AVG

–

() I

OUT

IOUT

=0.5A

VIN

=15V

VOUT

=5V

D= 5/15

ID1AVG

=333 mA

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