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参数资料
| 型号： | ISL8105BEVAL2Z |
| 厂商： | Intersil |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL8105B |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 15A |
| 输入电压： | 9.6 ~ 14.4V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL8105B |
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Using the ISL8105BEVAL1Z, ISL8105BEVAL2Z
PWM Controller Evaluation Board
Application Note
October 30, 2008
AN1288.1
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
In the evaluation board, a 1μH inductor with 1.87m Ω 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.
Reference Design
V RIPPLE = Δ I L ? ESR
(EQ. 2)
The ISL8105BEVAL1Z, ISL8105BEVAL2Z evaluation board
is designed to optimize for the output voltage and current
specifications shown in Table 1.
TABLE 1. ISL8105BEVAL1Z, ISL8105BEVAL2Z EVALUATION
BOARD DESIGN PARAMETERS
To meet the 30mV P-P output voltage ripple requirement, the
effective ESR should be less than 5m Ω .
The output voltage response to a transient load is
contributed from ESL, ESR and the amount of output
PARAMETER
MIN
TYP
MAX
capacitance. With V IN >>V OUT , the amplitude of the voltage
L ? I tran
C OUT ? V OUT
Input Voltage (V IN )
Output Voltage (V OUT )
Output Voltage Ripple (V RIPPLE )
9.6V
12V
1.8V
30mV P-P
14.4V
excursions can be approximated using Equation 3:
2
Δ V = -------------------------------------
(EQ. 3)
Continuous Load Current
Efficiency
90
15A
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
Two versions of the evaluation board, based on the package
type, are listed in Table 2.
TABLE 2. EVALUATION BOARDS
employed.
Input Capacitor Selection
The input bulk capacitors selection criteria are based on the
BOARD NAME
ISL8105BEVAL1Z
ISL8105BEVAL2Z
IC
ISL8105BIBZ
ISL8105BIRZ
PACKAGE
8 Ld SOIC
10 Ld DFN
capacitance and RMS current capability. The RMS current
rating requirement for the input capacitor is approximated in
Equation 4:
I O 2 ( D – D 2 ) + -------- D
V O
Design Procedure
I IN , RMS =
Δ I 2
12
D = ----------
VIN
(EQ. 4)
The following sections illustrate simple design steps and
component selections for a converter using the
In this application, the RMS current for the input capacitors is
5.4A; therefore, three of Sanyo’s 35ME330AX are used.
ISL8105BEVAL1Z, ISL8105BEVAL2Z.
Small ceramic capacitors for high frequency decoupling are
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:
also required to control the voltage overshoot across the
MOSFETs.
MOSFET Selection
The ISL8105B requires two N-Channel power MOSFETs as
V IN – V OUT V OUT 1
Δ I
= -------------------------- × ----------- × ----------------------
300 × 10
L = -------------------------------- × ---------------- × ------------
V IN F SW
14.4 – 1.8 1.8 1
0.4 ? 15 14.4 3
= 0.875 μ H
(EQ. 1)
the main and the synchronous switches. These should be
selected based in r DS(ON) , gate supply requirements and
thermal management requirements.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8105BIBZ | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8105BIBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8105BIRZ | 功能描述:IC REG CTRLR BUCK PWM VM 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8105BIRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8105CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
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