ISL8105BEVAL1Z Intersil, ISL8105BEVAL1Z Datasheet

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ISL8105BEVAL1Z

Manufacturer Part Number
ISL8105BEVAL1Z
Description
EVAL BOARD ISL8105B
Manufacturer
Intersil
Datasheets

Specifications of ISL8105BEVAL1Z

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.8V
Current - Output
15A
Voltage - Input
9.6 ~ 14.4V
Regulator Topology
Buck
Frequency - Switching
300kHz
Board Type
Fully Populated
Utilized Ic / Part
ISL8105B
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Introduction
The ISL8105B is a simple single-phase PWM controller for a
synchronous buck converter that operates from +5V or +12V
bias supply voltage. With integrated linear regulator, boot diode,
and gate drivers, the ISL8105B reduces external component
count and board space requirements.
The ISL8105BEVAL1Z, ISL8105BEVAL2Z evaluation board
highlights the operations of the controller in a DC/DC
application.
ISL8105BEVAL1Z , ISL8105BEVAL2Z
Reference Design
The ISL8105BEVAL1Z, ISL8105BEVAL2Z evaluation board
is designed to optimize for the output voltage and current
specifications shown in Table 1.
Two versions of the evaluation board, based on the package
type, are listed in Table 2.
Design Procedure
The following sections illustrate simple design steps and
component selections for a converter using the
ISL8105BEVAL1Z, ISL8105BEVAL2Z.
Output Inductor Selection
The output inductor is chosen by the desired inductor ripple
current, which is typically set to be approximately 40% of the
rated output current. The desired output inductor can be
calculated using Equation 1:
L
Input Voltage (V
Output Voltage (V
Output Voltage Ripple (V
Continuous Load Current
Efficiency
ISL8105BEVAL1Z
ISL8105BEVAL2Z
=
=
TABLE 1. ISL8105BEVAL1Z, ISL8105BEVAL2Z EVALUATION
14.4 1.8
------------------------- -
V
------------------------------- -
0.4 15
IN
BOARD NAME
ΔI
PARAMETER
=
V
OUT
0.875μH
BOARD DESIGN PARAMETERS
×
TABLE 2. EVALUATION BOARDS
---------- -
14.4
1.8
IN
×
OUT
)
V
--------------- -
V
OUT
×
IN
--------------------- -
300
)
RIPPLE
×
1
×10
----------- -
F
SW
1
3
®
)
ISL8105BIBZ
ISL8105BIRZ
1
9.6V
MIN
IC
Application Note
Using the ISL8105BEVAL1Z, ISL8105BEVAL2Z
30mV
1.8V
TYP
12V
90
P-P
PACKAGE
10 Ld DFN
8 Ld SOIC
14.4V
MAX
15A
(EQ. 1)
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
PWM Controller Evaluation Board
In the evaluation board, a 1µH inductor with 1.87mΩ DCR
(Cooper Bussmmann’s HC9-1R0-R) is employed. This yields
approximately 0.44W conduction loss in the inductor.
Output Capacitor Selection
The output capacitors are generally selected by the output
voltage ripple and load transient response requirements.
ESR and capacitor charge are major contributions to the
output voltage ripple. Assuming that the total output
capacitance is sufficient, then the output voltage ripple is
dominated by the ESR, which can be calculated using
Equation 2.
To meet the 30mV
effective ESR should be less than 5mΩ.
The output voltage response to a transient load is
contributed from ESL, ESR and the amount of output
capacitance. With V
excursions can be approximated using Equation 3:
With 1µH inductor and 0A to 15A step load, the total output
capacitance of 1560µF is required for 80mV output voltage
transient. In the ISL8105BEVAL1Z, ISL8105BEVAL2Z
evaluation board, four of Sanyo’s 2R5TPF470ML are
employed.
Input Capacitor Selection
The input bulk capacitors selection criteria are based on the
capacitance and RMS current capability. The RMS current
rating requirement for the input capacitor is approximated in
Equation 4:
In this application, the RMS current for the input capacitors is
5.4A; therefore, three of Sanyo’s 35ME330AX are used.
Small ceramic capacitors for high frequency decoupling are
also required to control the voltage overshoot across the
MOSFETs.
MOSFET Selection
The ISL8105B requires two N-Channel power MOSFETs as
the main and the synchronous switches. These should be
selected based in r
thermal management requirements.
ΔV
V
I
IN RMS
RIPPLE
,
=
October 30, 2008
------------------------------------ -
C
OUT
All other trademarks mentioned are the property of their respective owners.
L I
=
=
|
ΔI
Intersil (and design) is a registered trademark of Intersil Americas Inc.
2
tran
I
V
O
L
OUT
2
(
ESR
D D
P-P
DS(ON)
IN
Copyright Intersil Americas Inc. 2008. All Rights Reserved
2
>>V
output voltage ripple requirement, the
)
+
I Δ
------- - D
OUT
12
, gate supply requirements and
2
, the amplitude of the voltage
D
=
----------
VIN
V
O
AN1288.1
(EQ. 2)
(EQ. 3)
(EQ. 4)

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ISL8105BEVAL1Z Summary of contents

Page 1

... With 1µH inductor and 0A to 15A step load, the total output 15A capacitance of 1560µF is required for 80mV output voltage 90 transient. In the ISL8105BEVAL1Z, ISL8105BEVAL2Z evaluation board, four of Sanyo’s 2R5TPF470ML are employed. Input Capacitor Selection The input bulk capacitors selection criteria are based on the PACKAGE capacitance and RMS current capability ...

Page 2

... – RMS OUT ⎝ OUT Therefore, the ON-resistance of the low-side MOSFET must be less than 5mΩ. Infineon’s BSC030N03LS is employed in the ISL8105BEVAL1Z, ISL8105BEVAL2Z evaluation board. The conduction loss in the low-side MOSFET is calculated using Equation 7: 2 ⋅ LFET cond L RMS DS ON LFET ...

Page 3

... DCR be found in TB417 entitled “Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators”. C Evaluation Board Performance ESR Figure 2 shows a photograph of the ISL8105BEVAL1Z. (EQ. 15) for the target 4 Power and Load Connections Terminals J1 and J2 are connected to the input of the power stage ...

Page 4

... Figure 3 shows the start-up profile of the ISL8105BEVAL1Z, ISL8105BEVAL2Z in relation to the start-up of the 12V input supply and the bias supply. ...

Page 5

... IL VOUT FIGURE 7. TRANSIENT RESPONSE FIGURE 8. TRANSIENT RESPONSE FIGURE 9. TRANSIENT RESPONSE Efficiency ISL8105BEVAL1Z, ISL8105BEVAL2Z based regulators enable the design of highly efficient systems. The efficiency of the evaluation board using a 12V input supply is shown in Figure 10. 5 Application Note 1288 95 ...

Page 6

... ISL8105BEVAL1Z Schematic TP9 TP9 J1 J1 VIN VIN VIN J7 J7 C13 C13 C12 C12 + + + + 330uF 330uF 330uF 330uF 1.0uF 1.0uF VBIAS VBIAS U1 U1 TP7 TP7 VBIAS 5 VBIAS BOOT COMP/EN 7 COMP/EN TGATE GND BGATE/BSOC SW1 SW1 ISL8105B ISL8105B 2 3 TP10 TP10 GND GND ...

Page 7

... ISL8105BEVAL1Z Bill of Materials ID REFERENCE QTY Q2, Q4, Q5, Q6 DNP SW1 1 CAPACITORS C4, C9, C10 3 11 C5, C27, C28 C11, C12, C13 3 14 C18, C19, C20, C21 4 15 C6, C7, C14, C15, C16, C17, DNP C22, C23, C24, C25, C26 RESISTORS R7, R8 DNP OTHERS 23 TPVO1 DNP ...

Page 8

... ISL8105BEVAL1Z Printed Circuit Board Layers FIGURE 12. ISL8105BEVAL1Z - TOP LAYER (SILKSCREEN) FIGURE 14. ISL8105BEVAL1Z - LAYER 2 FIGURE 16. ISL8105BEVAL1Z - BOTTOM LAYER 8 Application Note 1288 FIGURE 13. ISL8105BEVAL1Z - TOP LAYER (COMPONENT SIDE) FIGURE 15. ISL8105BEVAL1Z - LAYER 3 FIGURE 17. ISL8105BEVAL1Z - BOTTOM LAYER (SOLDER SIDE) AN1288.1 October 30, 2008 ...

Page 9

... DNP DNP TP3 TP3 C26 C26 2 4 TPVO1 TPVO1 DNP DNP Intersil Corporation Intersil Corporation Intersil Corporation 1001 Murphy Ranch Rd. 1001 Murphy Ranch Rd. 1001 Murphy Ranch Rd. Milpitas, CA, 95035 Milpitas, CA, 95035 Milpitas, CA, 95035 Size Size Size Title Title Title ISL8105BEVAL2Z ISL8105BEVAL2Z ...

Page 10

... Jumper 5002 Test Point CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS Test Point CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS DESCRIPTION PACKAGE VENDOR 10 LD DFN Intersil TDSON-08 Infineon TDSON-08 Infineon SMD Cooper Bussmann PANASONIC SM_0603 TDK/Generic SM_0603 TDK/Generic SM_0603 TDK/Generic SM_0805 ...

Page 11

... FIGURE 20. ISL8105BEVAL2Z - LAYER 2 FIGURE 22. ISL8105BEVAL2Z - BOTTOM LAYER Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com ...

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