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Application Note 1946

10

AN

194

6

.0

Ju

ly

 7, 2

01

4

Submi

t D

ocument 

Feedba

ck

C2,C29

0

ea.

Capacitor

Not 
Placed

Not Placed. Place-holder for 
additional input and output cap

L1

1

ea.

Inductor

6.8µH

20

7.5x7.2

SMD, 17.84m

Ω

, ROHS

COILCRAFT

XAL7070-682MEB

L2 (HC9-100-R)

0

ea.

Inductor

Not 
Placed

Not Placed. Place-holder for 
other Inductor

D1

1

ea.

Diode-
Schottky

100V
200m
W

SOD-123

SMD, ROHS

DIODES INC.

BAT46W-7-F

U1

1

ea.

IC

4x4, 
24-pin QFB

ISL78268-Synchronous Buck 
Regulator, ROHS

INTERSIL

ISL78268ARZ

Q2, Q4

2

ea.

Transistor, 
NMOS

60V, 
80A

5x6, 
8-pin DFN

ROHS

ALPHA and OMEGA 
SEMICONDUCTOR

AON6246

Q1,Q3

0

ea.

Transistor, 
NMOS

Not 
Placed

5x6, 
8-pin DFN

Not Placed. Place-holder for 
additional NMOS-FET

R22

0

ea.

Resistor

Not 
placed

0805

SMD, Not Placed

R14

1

ea.

Resistor

10

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

KOA

RK73H1JT10R0F

R16

1

ea.

Resistor

15

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

YAGEO

RC0603FR-0715RL

R12, R21

2

ea.

Resistor

0

Ω

1/10W

Thick Film 0603

SMD, ROHS

VENKEL

CR0603-10W-000T

R5, R7, R11, R20

4

ea.

Resistor

10k

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

KOA

RK73H1JT1002F

R4

1

ea.

Resistor

130k

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

PANASONIC

ERJ-3EKF1303V

R1

1

ea.

Resistor

182k

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

YAGEO

RC0603FR-07182KL

R8, R15, R24, R28

4

ea.

Resistor

243

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

YAGEO

RC0603FR-07243RL

R13

1

ea.

Resistor

27.4k

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

PANASONIC

ERJ-3EKF2742V

R2

1

ea.

Resistor

28k

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

VENKEL

CR0603-10W-2802FT

R19

1

ea.

Resistor

3.24k

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

PANASONIC

ERJ-3EKF3241V

R18

1

ea.

Resistor

40.2k

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

YAGEO

RC0603FR-0740K2L

R9, R17, R25, R29

4

ea.

Resistor

422

Ω

1/10W

1

Thick Film 0603

SMD, ROHS

PANASONIC

ERJ-3EKF4220V

R6

1

ea.

Resistor

100k

Ω

1/8W

1

Thick Film 0805

SMD, ROHS

VENKEL

CR0805-8W-1003FT

R10,R27

2

ea.

Resistor

0.005

Ω

2/3W

1

Thin-Film 0805

Current Sense Resistor, SMD, 
ROHS

SUSUMU

KRL2012-M-R005-F

R3

0

ea.

Resistor

not 
placed

0603

SMD, Not Placed, Place-Holder 
for Type-3 compensation

R23, R27

0

ea.

Resistor

not 
placed

0603

SMD, Not Placed, Place-Holder 
for DCR Current Sensing

J1, J2, J26, J27

4

ea.

Connector, 
Jack

 0.175 PLUG MINI BANANA, NICKEL/BRASS, 

ROHS

KEYSTONE

575-4

TABLE 3. ISL78268EVAL1Z BUILD OF MATERIALS LIST (Continued)

REFERENCE DESIGNATOR QTY UNITS

COMPONENT 

TYPE

VALUE RATING

ACCURACY

(%)

TYPE

SIZE

OTHER DESCRIPTION

MANUFACTURER

MANUFACTURER PART

Summary of Contents for ISL78268EVAL1Z

Page 1: ...itching clock source internal or external Low shutdown current IQ 10 A Selectable latch off or hiccup mode fault response Comprehensive fault protections Input and output overvoltage protection Cycle...

Page 2: ...for detail Also the clock can be synchronized with the external clock source by input square wave at FSYNC pin The external clock frequency range will be 50kHz to 1 1MHz The output voltage of ISL7826...

Page 3: ...k ISL78268EVAL1Z Evaluation Board FIGURE 2 TOP VIEW FIGURE 3 BOTTOM VIEW J12 GND VCC J20 PHASE GND J28 VIN EN J6 GND SS J11 IMON DE VCC J8 GND IMONDE J17 GND FSYNC J10 GND EN VIN J19 GND CLKOUT J5 GND...

Page 4: ...system All voltages in this table are relative to potential at GND J2 If J28 is shorted with a jumper short between Pin 2 and Pin 3 of J10 to enable the system automatically when VIN is applied J11 IM...

Page 5: ...mper pins Table 2 on page 6 shows the detailed jumper pin settings for different operation modes Three typical operation modes examples are shown as follows 1 Diode Emulation Mode Enabled Hiccup Mode...

Page 6: ...s in 1 1 Confirm the Input voltage output voltage load current operation mode and OC2 functionality etc When Latch off is triggered the device stops switching and keeps switching off until the EN or V...

Page 7: ...en Open Open J21 PVCC GND Open Open Open Open Open J22 ISEN2P GND Open Open Open Open Open J23 ISEN2N GND Open Open Open Open Open J24 VOUT GND Open Open Open Open Open J26 VOUT Positive Terminal of L...

Page 8: ...LATCH IMON DE FB DNP AON6246 AON6246 DNP OUT OUT OUT OUT 4 4 3 2 1 2 1 2 1 2 1 2 1 2 3 2 1 4 8 7 6 5 25 1 4 5 6 13 14 15 16 17 18 3 2 1 2 1 2 1 2 5 6 7 8 1 2 3 4 VIN ISEN1N ISEN1P ISEN2N ISEN2P VCC CL...

Page 9: ...F 25V 10 X7R 0603 SMD ROHS MURATA GRM39X7R104K025AD C14 C25 2 ea Capacitor Ceramic 220pF 50V 10 X7R 0603 SMD ROHS MURATA GRM188R71H221KA01D C19 C32 2 ea Capacitor Ceramic 0 022 F 100V 10 X7R 0603 SMD...

Page 10: ...Thick Film 0603 SMD ROHS PANASONIC ERJ 3EKF1303V R1 1 ea Resistor 182k 1 10W 1 Thick Film 0603 SMD ROHS YAGEO RC0603FR 07182KL R8 R15 R24 R28 4 ea Resistor 243 1 10W 1 Thick Film 0603 SMD ROHS YAGEO...

Page 11: ...OHS BERG FCI 69190 202HLF Four corners 4 ea Screw 4 40x1 4in PAN SS PHILLIPS Four corners 4 ea Standoff 4 40x3 4in F F HEX ALUMINUM ROHS KEYSTONE 2204 250 OD AFFIX TO BACK OF PCB 1 ea Label LABEL DATE...

Page 12: ...ote 1946 12 AN1946 0 July 7 2014 Submit Document Feedback Layout Pattern 4 layers FIGURE 5 SILK PATTERN TOP FIGURE 6 TOP LAYER FIGURE 7 LAYER 2 FIGURE 8 LAYER 3 FIGURE 9 BOTTOM LAYER FIGURE 10 SILK PA...

Page 13: ...RE 15 FORCED PWM MODE VIN 36V VOUT 12V IOUT 2 5A L 4 7 H COUT 98 F fSW 300kHz FIGURE 16 FORCED PWM MODE VIN 36V VOUT 12V IOUT 1 0A L 4 7 H COUT 98 F fSW 300kHz 50 55 60 65 70 75 80 85 90 95 100 0 1 2...

Page 14: ...36V VOUT 12V IOUT 0A L 4 7 H COUT 98 F fSW 300kHz FIGURE 21 TRANSIENT RESPONSE DE MODE VIN 36V VOUT 12V IOUT 0 1A TO 4 5A L 4 7 H COUT 98 F FIGURE 22 TRANSIENT RESPONSE FORCED PWM MODE VIN 36V VOUT 1...

Page 15: ...ormation regarding Intersil Corporation and its products see www intersil com AN1946 0 July 7 2014 Submit Document Feedback FIGURE 23 HICCUP ACL VIN 30V VOUT 12V RIMON 156k FIGURE 24 AVERAGE CONSTANT...

Page 16: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Intersil ISL78268EVAL1Z...

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