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| 型号： | ISL6569ACBZ |
| 厂商： | Intersil |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 24-SOIC |
| 标准包装： | 600 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 75% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
ISL6569A
C 2
Switching Frequency
There are a number of variables to consider when choosing
R C
C C
COMP
the switching frequency, as there are considerable effects on
the upper-MOSFET loss calculation. These effects are
outlined in MOSFETs , and they establish the upper limit for
C 1
FB
the switching frequency. The lower limit is established by the
requirement for fast transient response and small output-
voltage ripple as outlined in Input Supply Voltage Selection .
R 1
R FB
IOUT
Choose the lowest switching frequency that allows the
regulator to meet the transient-response requirements.
VDIFF
1000
FIGURE 14. COMPENSATION CIRCUIT FOR ISL6569A BASED
CONVERTER WITHOUT LOAD-LINE
REGULATION
In the solutions to the compensation equations, there is a
single degree of freedom. For the solutions presented in
Equations 28, R FB is selected arbitrarily. The remaining
compensation components are then selected according to
Equations 28.
100
R 1 = R FB -----------------------------------------
C ( ESR )
LC – C ( ESR )
10
10
100 1000
10000
R FB
LC – C ( ESR )
C 1 = -----------------------------------------
SWITCHING FREQUENCY (kHz)
FIGURE 15. R T vs SWITCHING FREQUENCY
( 2 π ) 0 HF LCR FB V PP
C 2 = -------------------------------------------------------------------
V PP ? 2 π ? f 0 f HF LCR FB
R C = ---------------------------------------------------------------------
? 2 π f
HF LC – 1 ?
?
0.75 V
0.75V IN ? 2 π f
( 2 π ) 2 f 0 f HF LCR FB V PP
0.75V IN
2 f f
2
? ?
?
IN
?
? HF LC – 1 ?
C C = -------------------------------------------------------------------
(EQ. 28)
Switching frequency is determined by the selection of the
frequency-setting resistor, RT (see the figure Typical
Application on page 4). Figure 15 and Equation 29 are
provided to assist in the selecting the correct value for R T .
[ 11.09 – 1.13 log ( f S ) ] (EQ. 29)
R T = 10
Input Capacitor Selection
The input capacitors are responsible for sourcing the ac
component of the input current flowing into the upper
In Equations 28, L is the per-channel filter inductance
divided by the number of active channels; C is the sum total
of all output capacitors; ESR is the equivalent-series
resistance of the bulk output-filter capacitance; and V PP is
the peak-to-peak sawtooth signal amplitude as described in
Figure 6 and Electrical Specifications .
Input Supply Voltage Selection
The VCC input of the ISL6569A can be connected to either a
+5V supply directly or through a current limiting resistor to a
+12V supply. An integrated 5.8V shunt regulator maintains
the voltage on the VCC pin when a +12V supply is used. A
300 ? resistor is suggested for limiting the current into the
VCC pin to approximately 20mA.
19
MOSFETs. Their RMS current capacity must be sufficient to
handle the ac component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
For a two phase design, use Figure 16 to determine the
input-capacitor RMS current requirement given the duty
cycle, maximum sustained output current (I O ), and the ratio
of the combined peak-to-peak inductor current (I C,PP ) to I O .
Select a bulk capacitor with a ripple current rating which will
minimize the total number of input capacitors required to
support the RMS current calculated. The voltage rating of
the capacitors should also be at least 1.25 times greater
than the maximum input voltage.
FN9092.2
December 29, 2004
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6569ACBZ-T | 功能描述:IC REG CTRLR BUCK PWM 24-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) |
| ISL6569ACR | 功能描述:IC REG CTRLR BUCK PWM 32-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6569ACR-T | 功能描述:IC REG CTRLR BUCK PWM 32-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6569ACRZ | 功能描述:IC REG CTRLR BUCK PWM 32-QFN 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) |
| ISL6569ACRZ-T | 功能描述:IC REG CTRLR BUCK PWM 32-QFN 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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