参数资料
| 型号： | ISL6564IR-T |
| 厂商： | Intersil |
| 文件页数： | 23/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66.7% |
| 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： | -40°C ~ 85°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6564
C 2 (OPTIONAL)
C 2
R C
C C
COMP
R C
C C
COMP
FB
C 1
FB
R FB
+
V DROOP
IDROOP
R 1
R FB
IDROOP
-
VDIFF
VDIFF
FIGURE 19. COMPENSATION CIRCUIT FOR ISL6564 BASED
CONVERTER WITHOUT LOAD-LINE
------------------- > f 0
Case 1:
R C = R FB ------------------------------------
0.75V
C C = ------------------------------------
FIGURE 18. COMPENSATION CONFIGURATION FOR
LOAD-LINE REGULATED ISL6564 CIRCUIT
The feedback resistor, R FB , has already been chosen as
outlined in Load-Line Regulation Resistor . Select a target
bandwidth for the compensated system, f 0 . The target
bandwidth must be large enough to assure adequate
transient performance, but smaller than 1/3 of the per-
channel switching frequency. The values of the
compensation components depend on the relationships of f 0
to the L-C pole frequency and the ESR zero frequency. For
each of the three cases which follow, there is a separate set
of equations for the compensation components.
1
2 π LC
2 π f 0 V pp LC
IN
0.75V IN
2 π V PP R FB f 0
REGULATION
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 .
The optional capacitor C 2 , is sometimes needed to bypass
noise away from the PWM comparator (see Figure 21). Keep
a position available for C 2 , and be prepared to install a high-
frequency capacitor of between 22pF and 150pF in case any
leading-edge jitter problem is noted.
Once selected, the compensation values in Equations 23
assure a stable converter with reasonable transient
performance. In most cases, transient performance can be
improved by making adjustments to R C . Slowly increase the
value of R C while observing the transient performance on an
oscilloscope until no further improvement is noted. Normally,
C C will not need adjustment. Keep the value of C C from
Equations 23 unless some performance issue is noted.
------------------- ≤ f 0 < ------------------------------
Case 2:
1 1
2 π LC 2 π C ( ESR )
COMPENSATION WITHOUT LOAD-LINE REGULATION
The non load-line regulated converter is accurately modeled
V PP ( 2 π ) 2 f 02 LC
R C = R FB --------------------------------------------
0.75 V
0.75V IN
( 2 π ) 2 f 02 V PP R FB LC
IN
C C = -------------------------------------------------------------
(EQ. 24)
as a voltage-mode regulator with two poles at the L-C
resonant frequency and a zero at the ESR frequency. A
type III controller, as shown in Figure 22, provides the
necessary compensation.
The first step is to choose the desired bandwidth, f 0 , of the
compensated system. Choose a frequency high enough to
f 0 > ------------------------------
2 π f 0 V pp L
0.75 V IN ( ESR )
0.75V IN ( ESR ) C
2 π V PP R FB f 0 L
Case 3:
1
2 π C ( ESR )
R C = R FB ------------------------------------------
C C = -------------------------------------------------
assure adequate transient performance but not higher than
1/3 of the switching frequency. The type-III compensator has
an extra high-frequency pole, f HF . This pole can be used for
added noise rejection or to assure adequate attenuation at
the error-amplifier high-order pole and zero frequencies. A
good general rule is to choose f HF = 10f 0 , but it can be
higher if desired. Choosing f HF to be lower than 10f 0 can
cause problems with too much phase shift below the system
bandwidth.
In Equations 25, 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
23
In the solutions to the compensation equations, there is a
single degree of freedom. For the solutions presented in
Equations 26, R FB is selected arbitrarily. The remaining
FN9156.2
December 27, 2004
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相关代理商/技术参数 |
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| ISL6564IRZ | 功能描述:电流型 PWM 控制器 MULTI-PHS PWM CNTRLR W/0 525-1 3 VID INDU RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6564IRZ-T | 功能描述:电流型 PWM 控制器 MULTI-PHS PWM CNTRLR W/0 525-1 3 VID RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6565ACB | 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC 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) |
| ISL6565ACB-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC 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) |
| ISL6565ACBZ | 功能描述:IC REG CTRLR BUCK PWM VM 28-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) |
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