MCP16301HT-ESLASHCH datasheet(19/40 Pages) MICROCHIP

19 / 40 page

 2011-2015 Microchip Technology Inc.

DS20005004D-page 19

MCP16301/H

5.7

Freewheeling Diode

The freewheeling diode creates a path for inductor

current flow after the internal switch is turned off. The

average 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

freewheeling 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

voltage 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/H RECOMMENDED

3.3V INDUCTORS

Part Number

Size

WxLxH

(mm)

Coilcraft®

ME3220

0.52

0.90

3.2x2.5x2.0

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

LPS3015

0.700 0.61

3.0x3.0x1.4

Würth Elektronik Group®

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® Corporation

CDPH4D19F

0.075 0.66

5.2x5.2x2.0

CDRH3D161H

0.328 0.65

4.0x4.0x1.8

TDK-EPC®

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

Incorporated®

DFLS120L-7

20V, 1A

24 VIN

100 mA

Diodes

Incorporated

B0540Ws-7

40V, 0.5A

18 VIN

600 mA

Diodes

Incorporated

B130L-13-F

30V, 1A

ID1AVG

–

 I

OUT



IOUT

=0.5A

VIN

=15V

VOUT

=5V

D= 5/15

ID1AVG

=333 mA

MCP16301HT-E/CH датащи(PDF) 19 Page - Microchip Technology

MCP16301HT-E/CH датащи(HTML) 19 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

датащи скачать

ссылки URL