GRM188R71H332KA01B [INFINEON]

USER GUIDE FOR IR3895 EVALUATION BOARD; 用户指南IR3895评估板


型号：	GRM188R71H332KA01B
厂家：	Infineon
描述：	USER GUIDE FOR IR3895 EVALUATION BOARD 用户指南IR3895评估板电容器
文件：	总14页 (文件大小：4721K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

IRDC3895-P1V2

SupIRBuck

USER GUIDE FOR IR3895 EVALUATION BOARD

1.2Vout

DESCRIPTION

Output over-current protection function is

implemented by sensing the voltage developed

across the on-resistance of the synchronous

rectifier MOSFET for optimum cost and

performance and the current limit is thermally

compensated.

The IR3895 is

converter, providing

performance and flexible solution in a small

5mm X 6 mm Power QFN package.

synchronous buck

compact, high

Key features offered by the IR3895 include

internal Digital Soft Start/Soft Stop, precision

This user guide contains the schematic and bill

of materials for the IR3895 evaluation board.

The guide describes operation and use of the

evaluation board itself. Detailed application

information for IR3895 is available in the

IR3895 data sheet.

0.5Vreference voltage, Power Good,

thermal protection, programmable switching

frequency, Enable input, input under-voltage

lockout for proper start-up, enhanced line/

load regulation with feed forward, external

frequency synchronization with smooth

clocking, smart internal LDO and pre-bias

start-up.

BOARD FEATURES

• V_in= +12V (+ 13.2V Max)

•V_out= +1.2V @ 0- 16A

• F_s=600kHz

• L= 0.4uH

• C_in= 5x10uF (ceramic 1206) + 1X330uF (electrolytic)

• C_out=6x47uF (ceramic 0805)

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IRDC3895-P1V2

CONNECTIONS AND OPERATING INSTRUCTIONS

A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum of 16A load should

be connected to VOUT+ and VOUT-. The input and output connections of the board are listed in Table I.

IR3895 has only one input supply and internal LDO generates Vcc from Vin. If operation with external Vcc

is required, then R15 can be removed and external Vcc can be applied between Vcc+ and Vcc- pins. Vin pin

and Vcc/LDOout pins should be shorted together for external Vcc operation (use zero ohm resistor for R29).

The output can track voltage at the Vp pin. For this purpose, Vref pin is to be connected to ground (use zero

ohm resistor for R21). The value of R14 and R28 can be selected to provide the desired tracking ratio

between output voltage and the tracking input.

Table I. Connections

Connection

VIN+

Signal Name

Vin (+12V)

VIN-

Vout+

Vout-

Vcc+

Vcc-

Ground of Vin

Vout(+1.2V)

Ground for Vout

Vcc/ LDO_out Pin

Ground for Vcc input

Enable

PGood

Gnd

Power Good Signal

Analog ground

LAYOUT

The PCB is a 4-layer board (2.23”x2”) using FR4 material. All layers use 2 Oz. copper. The PCB

thickness is 0.062”. The IR3895 and other major power components are mounted on the top side of the

board.

Power supply decoupling capacitors, the bootstrap capacitor and feedback components are located

close to IR3895. The feedback resistors are connected to the output at the point of regulation and are

located close to the SupIRBuck IC. To improve efficiency, the circuit board is designed to minimize the

length of the on-board power ground current path.

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IRDC3895-P1V2

Vin

Gnd Gnd Vout

Enable

VDDQ

Top View

Vref

Sync

PGood

AGnd

S_Ctrl Vsns Vcc+

Vcc-

Bottom View

Fig. 1: Connection Diagram of IR3895/94 Evaluation Boards

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IRDC3895-P1V2

Fig. 2: Board Layout-Top Layer

Single point connection between

Analog Gnd and PGnd

Fig. 3: Board Layout-Bottom Layer

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IRDC3895-P1V2

Fig. 4: Board Layout-Mid Layer 1

Fig. 5: Board Layout-Mid Layer 2

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IRDC3895-P1V2

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IRDC3895-P1V2

Bill of Materials

Item Qty

Part Reference

Value

330uF

10uF

0.1uF

1nF

Description

Manufacturer

Part Number

EEV-FK1E331P

SMD Electrolytic F size 25V 20%

Panasonic

1206, 25V, X5R, 20%

C2 C3 C4 C5 C6

TDK

C3216X5R1E106M

GRM188R71E104KA01B

GRM1885C1E102JA01D

C7 C14 C24

0603, 25V, X7R, 10%

0603, 25V, COG, 5%

Murata

C12

3300pF

220pF

47uF

2.2uF

10nF

1.0uF

0.4uH

1.78k

4.02k

2.87k

100

0603,50V,X7R,10%

0603, 50V, COG, 5%

Murata

GRM188R71H332KA01B

GRM1885C1H221JA01D

C11

0805, 6.3V, X5R, 20%

0603, 16V, X5R, 20%

0603, 25V, X7R, 10%

0603, 25V, X5R, 10%

C15 C16 C17 C18 C19 C20

TDK

C2012X5R0J476M

C1608X5R1C475M

GRM188R71E103KA01J

GRM188R61E105KA12D

59PR9875N

C23

TDK

C26

Murata

111

C32

Murata

SMD 11.0x7.2x7.5mm,0.29mΩ

Vitec

Thick Film, 0603,1/10W,1%

Panasonic

ERJ-3EKF17801V

ERJ-3EKF4021V

ERJ-3EKF2871V

ERJ-3EKF1000V

ERJ-3EKF20R0V

ERJ-3EKF3922V

ERJ-3GEY0R00V

ERJ-3EKF4992V

ERJ-3EKF7551V

IR3895MPBF

Thick Film, 0603,1/10W,1%

Thick Film, 0603,1/10W

R2 R11

R3 R12

39.2k

R10 R13 R14 R15 R50

Thick Film, 0603,1/10W,1%

R17 R18

R19

49.9k

7.5k

IR3895

PQFN 5x6mm

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IRDC3895-P1V2

TYPICAL OPERATING WAVEFORMS

Vin=12.0V, Vo=1.2V, Io=0-16A, Room Temperature, no airflow

Fig. 7: Start up at 16A Load

Fig. 8: Start up at 16A Load

Ch₁:V_out, Ch₂:V_in, Ch₃:PGood,Ch₄:Enable

Ch₁:V_out, Ch₂:V_in, Ch₃: PGood,Ch₄:Vcc

Fig. 10: Output Voltage Ripple, 16A load

Ch₁: V_{out ,}

Fig. 9: Start up with Pre Bias , 0A Load,

Ch₁:V_o

Fig. 12: Short circuit (Hiccup) Recovery

Ch₁:V_out, Ch4:Iout

Fig. 11: Inductor node at 16A load

Ch₁:Switch Node

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IRDC3895-P1V2

TYPICAL OPERATING WAVEFORMS

Vin=12.0V, Vo=1.2V, Io=0-16A, Room Temperature, no air flow

Fig. 13: Transient Response, 8A to 16A step @2.5A/usec slew rate

Ch₁:V_outCh4-Iout

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IRDC3895-P1V2

TYPICAL OPERATING WAVEFORMS

Vin=12.0V, Vo=1.2V, Io=0-16A, Room Temperature

Fig. 14: Bode Plot at 16A load shows a bandwidth of 95.2kHz and phase margin of 54.5º

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IRDC3895-P1V2

TYPICAL OPERATING WAVEFORMS

Vin=12.0V, Vo=1.2V, Io=0-16A, Room Temperature, no air flow

Fig (15) Soft start and soft stop using S_Ctrl pin

Fig (16) Feed Forward for Vin change from 6.8 to 16V and back to 6.8V

Ch₁-Vout Ch₄-Vin

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IRDC3895-P1V2

TYPICAL OPERATING WAVEFORMS

Vin=12.0V, Vo=1.2V, Io=0-16A, Room Temperature, no air flow

Fig.17: Efficiency versus load current

Fig.18: Power loss versus load current

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IRDC3895-P1V2

THERMAL IMAGES

Vin=12.0V, Vo=1.2V, Io=0-16A, Room Temperature, No Air flow

Fig. 19: Thermal Image of the board at 16A load

Test point 1 is IR3895

Test point 2 is inductor

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IRDC3895-P1V2

PACKAGE INFORMATION

MILIMITERS

MIN MAX

INCHES

MIN MAX

MILIMITERS

INCHES

MIN MAX

DIM

MIN

MAX

0.800 1.000 0.0315 0.0394

0.000 0.050 0.0000 0.0020

0.375 0.475 0.1477 0.1871

0.250 0.350 0.0098 0.1379

0.350

2.441

0.703

2.079

3.242

1.265

2.644

1.500

0.450 0.0138 0.0177

2.541 0.0961 0.1000

0.803 0.0277 0.0316

2.179 0.0819 0.0858

3.342 0.1276 0.1316

1.365 0.0498 0.0537

2.744 0.1041 0.1080

1.600 0.0591 0.0630

0.203 REF.

5.000 BASIC

6.000 BASIC

1.033 BASIC

0.650 BASIC

0.852 BASIC

0.008 REF.

1.969 BASIC

2.362 BASIC

0.0407 BASIC

0.0256 BASIC

0.0335 BASIC

t1, t2, t3

0.401 BASIC

1.153 BASIC

0.727 BASIC

0.016 BACIS

0.045 BASIC

0.0286 BASIC

Figure 20: Package Dimensions

IR WORLD HEADQUARTERS: ^{233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105}

TAC Fax: (310) 252-7903

This product has been designed and qualified for the Industrial market

Visit us at www.irf.com for sales contact information

Data and specifications subject to change without notice. 12/11

12/22/2011

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