reference board user’s manual for sic461, sic462, sic471 ...j5 setup resistance between vout and...

SiC461, SiC462, SiC471, SiC472www.vishay.com Vishay Siliconix

S21-0392-Rev. B, 23-Apr-2021 1 Document Number: 77534For technical questions, contact: [email protected]

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENTARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

Reference Board User’s Manual for SiC461, SiC462, SiC471, and SiC472 Synchronous Buck Regulators

DESCRIPTIONThis reference board allows the user to evaluate the SiC461, SiC462, SiC471, and SiC472 microBUCK®

regulators for their features and functionalities. It can also be a reference design for a user’s application. The board is configured for 4.5 V to 50 V input. Output current capability is model dependent. The operating range may be modified by changing components such as the inductor, feedback resistor, and ripple injection networks.

The SiC46x and SiC47x family of microBUCK regulators is a wide input voltage high efficiency synchronous buck regulator with integrated high side and low side power MOSFETs. Its power stage is capable of supplying up to 10 A continuous current at up to 2 MHz switching frequency. These regulators produce an adjustable output voltage down to 0.8 V from 4.5 V to 60 V input rail to accommodate a variety of applications, including computing, consumer electronics, telecom, and industrial.

SiC461, SiC462, SiC471, and SiC472 control architecture delivers ultrafast transient response with minimum output capacitance and tight ripple regulation at very light load. The device is stable with any type of output capacitor. The device also incorporates a power saving scheme that significantly increases light load efficiency.

This board has UVLO capability on the input rail and a user programmable soft start.

FEATURES• Versatile

- Single supply operation from 4.5 V to 60 V input voltage for SiC461 and SiC462, and 55 V for SiC471 and SiC472

- Adjustable output voltage down to 0.8 V- Scalable solution from 2 A to 12 A- Support start-up with pre-bias output voltage- ± 1 % output voltage accuracy at -40 °C to +125 °C

• Highly efficient- 98 % peak efficiency- 5 μA supply current at shutdown- 250 μA operating current not switching

• Highly configurable- Adjustable switching frequency from 100 kHz to 2 MHz- Adjustable soft start and adjustable current limit- 3 modes of operation, forced continuous conduction,

power save or ultrasonic• Robust and reliable

- Output over-voltage protection- Output under-voltage / short circuit protection with auto

retry- Power good flag and over temperature protection

• Design support tool- PowerCAD online design simulation

https://vishay.transim.com/landing.aspx- Inductor selection tool

www.vishay.com/inductors/calculator/calculator/

• Material categorization: for definitions of compliance please see www.vishay.com/doc?99912

APPLICATIONS• Industrial and automation• Home automation• Industrial computing• Base station power supplies• Wall transformer regulation• Robotics• Drones• Battery management systems• Power tools• Vending, ATM, and slot machine

SPECIFICATIONSThis reference board allows the end user to evaluate the SiC461, SiC462, SiC471, and SiC472 microBUCKregulators for their features and functionalities. It can also be a reference design for a user’s application. The board is configured for 4.5 V to 50 V input with different output voltages depending on the model number of the board. The operating range may be modified by changing components such as the inductor, feedback resistor, and ripple injection networks.

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BOARD CONFIGURATION TABLE

CONNECTION AND SIGNAL / TEST POINTS

Power Terminals (J4)

VIN, GND (J4, pin 1 and pin 2): (see Fig. 1)

Fig. 1 - PCB Showing Power Terminal Connections

Connect to a voltage source: 4.5 V to 50 V. Input voltage’s under-voltage lockout (VIN UVLO) function can be instituted by inserting a suitable value resistor for R2. The minimum input voltage will be 4.5 V when R2 is not inserted

VOUT, GND (J4, pin 3 and pin 4): (see Fig. 1)

Connect to a load that draws no more than: SiC461 - 10 A, SiC462 - 6 A SiC471 - 12 A, SiC472 - 8 A

The output voltage is selectable on J5

Warning

The output capacitors are rated to 25 V. Should a higher output voltage be required, the output capacitors must be changed to ones with an appropriate higher voltage rating.

SELECTION JUMPERS

Operation Mode Select Using J2 and J6

J2 allows the user to select modes of power saving and whether using an internal LDO regulator or an external power supply as VDRV for operation.

J6 allows the user to further select the ultrasonic mode of power saving. In ultrasonic mode the minimum frequency of operation is 20 kHz, above the audible range. When not in ultrasonic mode the frequency can drop below 20 kHz.

The table below lists all modes of operation and their related jumper setup.

External VDRV Supply

5 V (TP5), GND (TP6): this is the terminal that enables the user to use an external 5 VDC supply as MOSFET gate driver supply when mode 3 or mode 4 in table “Operation Modes” is selected. This should only be used in mode 3 and mode 4.

Enable

J1 this is a 2 pin header crossing EN pin to ground.

The EN pin has an internal high impedance pull down resistor and requires an DC voltage higher than 1.35 V to enable chip operation. Shorting J1 with a jumper will disable the chip operation.

Output Voltage VOUT Setting

J5 allows the user to choose four options of output voltage divider to set different output voltage VOUT. J5 is a 4 x 2 eight pin header and table “Output Voltage Setting” lists the available voltage setting and related jumper setup. The user can use equation in datasheet to calculate required resistance for a designated output voltage.

ORDERING INFORMATIONBOARD PART NUMBER

MAXIMUM OUTPUT CURRENT BOARD MARKING

SiC461EVB-A 10 A UB46A




SiC461, SiC471 EVB TYPICAL PRE-DEFINED OPERATING CONFIGURATIONS

VIN (V) VOUT (V) fsw (kHz) L (μH)MAXIMUM

IOUT (A)SiC461 / SiC471

48.0 3.3 300 3.3 10 / 12

48.0 5.0 300 5.6 10 / 12

48.0 12.0 300 10 10 / 12

SiC462, SiC472 EVB TYPICAL PRE-DEFINED OPERATING CONFIGURATIONS

VIN (V) VOUT (V) fsw (kHz) L (μH)MAXIMUM

IOUT (A)SiC462 / SiC472

48.0 3.3 300 5.6 6 / 8

48.0 5.0 300 8.2 6 / 8

48.0 12.0 300 15.0 6 / 8

70 mm

{+

-VIN

{+

-VOUT

55 m

m

OPERATION MODES

MODEPOWER

SAFE MODE

VDRV SUPPLY

J2 SETUP

ULTRASONIC ENABLED

J6 SETUP

1 Enabled Internal LDOPin 1 to 2 shorted

Yes Shorted

No Open

2 Disabled Internal LDOPin 3 to 4 shorted n/a Open

3 Disabled External supplyPin 5 to 6 shorted n/a Open

4 Enabled External supplyPin 7 to 8 shorted

Yes Shorted

No Open

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Switching Frequency fsw Setting

J3 allows the user to choose correct resistance to achieve 300 kHz switching frequency after the users set up output voltage following table “Output Voltage Setting”. J3 is a 2 x 2 four pin header and it generates logic level of input pins of U1 (DG2034, multiplexers). Table “Switching Frequency Setting” lists the related logic level of U1 matching different output voltages in table “Output Voltage Setting” and related J3 jumper setup. The user can use equation in datasheet to calculate required resistance to achieve a desired switching frequency with a designated output voltage.

Note(1) VOUT set in table “Output Voltage Setting”

SIGNALS AND TEST LEADS

Input Voltage Sense

VIN_SENSE (TP3), GNDIN_SENSE (TP4): this allows the user to measure the voltage directly at the input of the regulator bypassing any losses generated by connections to the board. These test points can also be as a remote sense port of a power source with remote sense capability.

Output Voltage Sense

VOUT_SENSE (TP7), GNDOUT_SENSE (TP8): this allows the user to measure the output voltage directly at the sense point of the regulator bypassing any losses generated by connections to the board. These test points can also be as a remote sense port of an external load with remote sense capability.

Power Good Indicator

PGOOD: is an open drain output and is pulled up with a 102 kΩ resistor, R3, to VDD (5 V). When FB or VOUT are within -10 % to +20 % of the set voltage this pin will go HI to indicate the output is okay.

Power Up Procedure

Before turning on the reference board, the user needs to select one of the four modes by shorting one jumper (see section on mode selection). If mode 3 or mode 4 is selected, make sure VDRV pin is supplied by external 5 V. There is no specific power sequence requirement to power up the board.

Snubber Circuit

Snubber may be used when the user desire to decrease the peak voltage of switching node SW during turn on of the high side switch. There are place holders on the reference board, R16A1, R23, and C28, for the snubber.

OUTPUT VOLTAGE SETTINGVOUT DESIRED (V) J5 SETUP

RESISTANCE BETWEEN VOUT AND FB PIN (kΩ)

Customized Pin 1 to 2 shorted Not populated; customized R18 following datasheet

3.3 Pin 3 to 4 shorted 31.6

5.0 Pin 5 to 6 shorted 52.3

12.0 Pin 7 to 8 shorted 140

SWITCHING FREQUENCY SETTINGSWITCHING FREQUENCY DESIRED (kHZ)

VOUT (V) (1)

U1 INPUT LOGIC

J3 JUMPER SETUP

RESISTANCE BETWEEN

fSW AND GND (kΩ)

300

3.3 2‘b01 Pin 1 to 2 shorted 57.6

5.0 2‘b10 Pin 3 to 4 shorted 88.7

12.0 2‘b11Pin 1 to 2 and 3 to 4

shorted210.0

Others 2‘b00All pins leave open

Not populated; customized

R10 following datasheet





SCHEMATIC FOR SiC461, SiC462, SiC471, AND SiC472

TP7

1

R_E

N_L

PB

1

CO

N2

1 2C

23

22uF

R19

31.6

K

R23

, R16

A a

nd C

28 c

omp

rise

anop

tiona

l snu

bb

er n

etw

ork

Cx

IC1

SW112

SW213

SW314

GL15

VD

RV

16

PG

ND

417

AG

ND

-PA

D28

ULTRASONIC18

SS19

PHASE26

PHASE15

BOOT4

EN3

PGOOD2

VC

IN1

PG

ND

311

PG

ND

210

PG

ND

19

VIN

28

VIN

17

VSNS20

CO

MP

21V

FB

22AG

ND

23FS

W24

ILIM

IT25

VD

D26

MO

DE

27

PG

ND

-PA

D30

VIN

-PA

D29

R22

8.66

K

SiC

461/

2

C_Boot

C8

2.2u

FJ4

CO

N4

1 2 3 4

C22

22uF

R4

3.3

R11

10K

U1

DG2034

A0

1

S1

2

S3

4

EN

5V

+6

S4

7C

OM

8G

ND

3S

29

A1

10

C11

2.2u

F

R20

52.3

K

Mo

de

2

VO

UT

_S

C2

mus

t b

e pl

aced

as

clos

e as

poss

ible

to

U1.

Typi

cally

mou

nted

from

VC

in,

Pin

1, t

o th

e an

alog

grou

nd p

ad,

Pin

28

J5

HE

AD

ER

4X

22 4 6 8

1 3 5 7

BOOT

C3

1uF

AG

ND

FS

W

SS

+V

in

R_EN_H

Ultrasonic

VDRV

C13

680p

F

R2

DN

P

J2

HE

AD

ER

4X

22 4 6 8

1 3 5 7

VD

D

VO

GN

DIN

_S

R16

88.7

K

Cco

mp

Rx

J1 HE

AD

ER

2x1

12

TP1

1

TP3

1

R14

100K

R_fsw

_12

R2

114

0K

Vin

_S

TP8

1

R_P

GD

+C

27

100uF/25V

1 2

3

C19

0.1u

F

OU

TPU

T VO

LTAG

E &

FS

W S

ELE

CT

J3H

EA

DE

R 2

X 2

2 41 3

C10

2.2u

F

C2

0.1u

FIL

IM

D1

8.2V

Cd

d

C15

33nF

PG

D

MO

DE

TP4

1

GN

DO

UT

_S

TP5

1

R8

2K

R_F

B_H

_5V

0

R10

DN

P

Mo

de

1

R12

47.5

K

PG

ND

3.3

V o

utpu

t / 3

00kH

z: J

5 (ju

mp

er 3

-4) /

J3

(jum

per

1-2

(labe

l "A

" on

PC

B))

5V

out

put /

300

kHz:

J5

(jum

per

5-6

) / J

3 (ju

mpe

r 3-

4(la

bel "

B"

on P

CB

))1

2V o

utpu

t / 3

00kH

z: J

5 (ju

mpe

r 7-

8) /

J3 (j

umpe

r 1

-2(la

bel "

A")

& 3

-4 (l

abel

"B

"))

Use

r de

fined

out

put/

Fsw

: J5

(jum

per

1-2

& p

opul

ate sp

ecifi

c R

18 fo

r R

FB_H

)

J3

(no

jum

per

and

pop

ulat

e sp

ecifi

c R

10 fo

r R

fsw

).

C6

2.2u

F

FS

W

Rco

mp

-Vin

C28

DN

P

+C26

DNP

+V

ou

t

R15

57.6

K

AG

ND

PG

D

R5

1M

R1

10K

J6H

EA

DE

R2x

1

12

VO

Ena

ble

C1

0.1u

F

R_F

B_L

VD

D

+C4

100uF 63V

R7

301K

C21

22uF

R_fsw

_5V

0

Cd

rv

AG

ND

R6

499K C25

22uF

R18

DN

P

Cin

2

C9

2.2u

F

MO

DE1

: Jum

per

1-2

: P

ower

sav

e m

ode,

inte

rnal

LD

O s

upp

ly V

DR

VM

OD

E2: J

umpe

r 3-

4 :

Forc

e P

WM

mod

e, in

tern

al L

DO

sup

ply

VD

RV

MO

DE3

: Jum

per

5-6

: Fo

rce

PW

M m

ode,

ext

erna

l sup

ply

VD

RV

M

OD

E4: J

umpe

r 7-

8 :

Pow

er s

ave

mod

e, e

xter

nal s

uppl

y V

DR

V

A m

ode

mus

t be sl

ecte

d fo

r op

erat

ion

C24

22uF

FS

W

Ultr

aso

nic

C14

1uF

TP2

1

R_F

B_H

_3V

3

SW

Ext

VD

RV

C12

0.1u

F

Mo

de

4

C16

4.7u

F

VO

_GN

D

CO

MP

C7

2.2u

F

Mo

de

3

R23

DN

P

TP9 1

R_F

B_H

_12

Cy

FS

W

-Vout

Rlim

EN

AB

LE

VF

B

R_fsw

_3V

3

C20

22uF

R3

102K

AG

ND

SiC

471/

2

VD

DV

IN

R13

100K

L15.

6uH

R9

61.9

K

R1

6A1

DN

P

AG

ND

Cout2

C18

10nF

C17

3.9n

F

R_Boot

Css

MO

DE S

ELEC

T

SW

R17

210K

TP6

1





PCB LAYOUT FOR SiC461, SiC462, SiC471, AND SiC472

Fig. 2 - Top Layer

Fig. 3 - Inner Layer 3




Fig. 7 - Bottom Layer





BILL OF MATERIAL REPORT FOR SiC461, SiC462, SiC471, AND SiC472SYM_NAME BOM FOR SiC461, SiC471 BOM FOR SiC462, SiC472 QTY REFDES

1210 DNP DNP 1 R16A10603 0.1 μF ± 10 % 50 V X7R 0603 0.1 μF ± 10 % 50 V X7R 0603 2 C1; C190603 0.1 μF ± 10 % 100 V X7R 0603 0.1 μF ± 10 % 100 V X7R 0603 2 C2; C120603 1 μF ± 10 % 25 V X7R 0603 1 μF ± 10 % 25 V X7R 0603 2 C3, C140603 680 pF ± 5 % 50 V C0G/NP0 0603 680 pF ±5 % 50 V C0G/NP0 0603 1 C130603 33 nF ± 10 % 25 V X7R 0603 33 nF ± 10 % 25 V X7R 0603 1 C150603 4.7 μF ± 10 % 10 V X7S 0603 4.7 μF ± 10 % 10 V X7S 0603 1 C160603 3.9 nF ± 5 % 50 V C0G/NP0 0603 3.9 nF ± 5 % 50 V C0G/NP0 0603 1 C170603 DNP DNP 1 C280805 10 nF ± 5 % 50 V C0G/NP0 0805 10 nF ± 5 % 50 V C0G/NP0 0805 1 C181210 2.2 μF ± 10 % 100 V X7R 1210 2.2 μF ± 10 % 100 V X7R 1210 6 C6; C7; C8; C9; C10; C111210 22 μF ± 10 % 25 V X7R 1210 22 μF ± 10 % 25 V X7R 1210 6 C20; C21; C22; C23; C24; C25

CAP10P5 100 μF ± 20 % 63 V 100 μF ± 20 % 63 V 1 C4CAP10P5 DNP DNP 1 C26

D3L 100 μF 25 V 100 μF 25 V 1 C27ED120-4DS2 CON4 CON4 1 J4

IHLP5050FDER5R6M015.6 μH, 20 %, 9.3 mΩ DCR,

13.5 A IRMS, 32 A ISAT 1 at 25 °C (20 % roll off)

IHLP6767GZER8R2M11 8.2 μH, 20 %, 7.71 mΩ DCR, 21 A IRMS, 18 A ISAT 1 at 25 °C

(20 % roll off)

1 L1 (recommended for VOUT = 5.0 V)

IHLP5050FDER3R3M01 3.3 μH, 20 %, 5.7 mΩ DCR,

18 A IRMS, 35 A ISAT 1 at 25 °C (20 % roll off)

IHLP5050FDER5R6M01 5.6 μH 20 %, 9.30 mΩ DCR,


1L1 (DNP)

(recommended for VOUT = 3.3 V)

IHLP6767GZER100M01 10 μH 20 %, 11.6 mΩ DCR,


IHLP6767GZER150M01 15 μH, 20 %, 18.8 mΩ DCR,


1L1 (DNP)

(recommended for VOUT = 12.0 V)

MINIJUMPER2 HEADER 2 x 1 HEADER 2 x 1 2 J1, J6MINIJUMPER2X2 HEADER 2 x 2 HEADER 2 x 2 1 J3MINIJUMPER2X4 HEADER 4 x 2 HEADER 4 x 2 2 J2; J5

MSOP10 DG2034 DG2034 1 U10603 10 kΩ ±1% 10 kΩ ±1% 2 R1, R110603 DNP DNP 4 R2; R10; R18; R230603 102 kΩ ± 1% 102 kΩ ± 1% 1 R30603 3.3 Ω ± 1% 3.3 Ω ± 1% 1 R40603 1 MΩ ± 1% 1 MΩ ± 1% 1 R50603 499 kΩ ± 1% 499 kΩ ± 1% 1 R60603 301 kΩ ± 1% 301 kΩ ± 1% 1 R70603 2 kΩ ± 1% 2 kΩ ± 1% 1 R80603 61.9 kΩ ± 1% 61.9 kΩ ± 1% 1 R90603 47.5 kΩ ± 1% 47.5 kΩ ± 1% 1 R120603 100 kΩ ± 1% 100 kΩ ± 1% 2 R13; R140603 57.6 kΩ ± 1% 57.6 kΩ ± 1% 1 R150603 88.7 kΩ ± 1% 88.7 kΩ ± 1% 1 R160603 210 kΩ ± 1% 210 kΩ ± 1% 1 R170603 31.6 kΩ ± 1% 31.6 kΩ ± 1% 1 R190603 52.3 kΩ ± 1% 52.3 kΩ ± 1% 1 R200603 140 kΩ ± 1% 140 kΩ ± 1% R210805 8.66 kΩ ± 1% 8.66 kΩ ± 1% 1 R22

SiC461, SiC471 SiC462, SiC472 1 IC1SOD323 8.2 V 8.2 V 1 D1

Test point, red Test point, red 2 TP3, TP7Test point, black Test point, black 4 TP4, TP8, TP1, TP6Test point, white Test point, white 2 TP9, TP5

DNP DNP 1 TP2JUMPER 5 OFF BOARD x 5

UB46A UB46A 1 PCB

reference board user’s manual for sic461, sic462, sic471 ...j5 setup resistance between vout and...

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