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参数资料
| 型号： | ISL6559CB |
| 厂商： | Intersil |
| 文件页数： | 16/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28-SOIC |
| 标准包装： | 26 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 4MHz |
| 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： | 28-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
ISL6559
each of the three cases which follow, there is a separate set
of equations for the compensation components.
C 2
------------------- > f 0
R C = R FB ------------------------------------
0.75V
2 π V PP R FB f 0
------------------- ≤ f 0 < ------------------------------
Case 1:
Case 2:
1
2 π LC
2 π f 0 V pp LC
IN
0.75V IN
C C = ------------------------------------
1 1
2 π LC 2 π C ( ESR )
C 1
R 1
R C
R FB
C C
COMP
FB
IOUT
VDIFF
R C = R FB --------------------------------------------
( 2 π ) 2 f 02 V PP R FB LC
V PP ( 2 π ) 2 f 02 LC
0.75 V IN
0.75V IN
C C = -------------------------------------------------------------
(EQ. 23)
FIGURE 13. COMPENSATION CIRCUIT FOR ISL6559 BASED
CONVERTER WITHOUT LOAD-LINE
REGULATION.
COMPENSATION WITHOUT LOAD-LINE REGULATION
f 0 > ------------------------------
Case 3:
1
2 π C ( ESR )
The non load-line regulated converter is accurately modeled
as a voltage-mode regulator with two poles at the L-C
0.75 V IN ( ESR )
2 π V PP R FB f 0 L
R 1 = R FB -----------------------------------------
C 1 = -----------------------------------------
( 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
2 π f 0 V pp L
R C = R FB ------------------------------------------
0.75V IN ( ESR ) C
C C = -------------------------------------------------
In Equations 23, 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 4 and Electrical Specifications .
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.
The optional capacitor C 2 , is sometimes needed to bypass
noise away from the PWM comparator (see Figure 12). Keep
a position available for C 2 , and be prepared to install a high-
frequency capacitor of between 22pF and 150pF in case any
trailing edge jitter problem is noted.
resonant frequency and a zero at the ESR frequency. A
type III controller, as shown in Figure 13, 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
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 chose 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 the solutions to the compensation equations, there is a single
degree of freedom. For the solutions presented in Equations
24, R FB is selected arbitrarily. The remaining compensation
components are then selected according to Equations 24.
C ( ESR )
LC – C ( ESR )
LC – C ( ESR )
R FB
0.75V IN
2 f f
2
? ?
?
IN
0.75V IN ? 2 π f
( 2 π ) 2 f 0 f HF LCR FB V PP
16
?
? HF LC – 1 ?
C C = -------------------------------------------------------------------
(EQ. 24)
FN9084.8
December 29, 2004
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相关代理商/技术参数 |
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| ISL6559CB-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:4,000 系列:- 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) |
| ISL6559CBZ | 功能描述:电流型 PWM 控制器 2 TO 4 PHS BUCK CNTRLR 2 8LD 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 |
| ISL6559CBZ-T | 功能描述:电流型 PWM 控制器 2 TO 4 PHS BUCK CNTRLR 2 8LD 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 |
| ISL6559CR | 功能描述:IC REG CTRLR BUCK PWM VM 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:4,000 系列:- 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) |
| ISL6559CR-T | 功能描述:IC REG CTRLR BUCK PWM VM 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:4,000 系列:- 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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