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| 型号： | ISL6322GCRZ |
| 厂商： | Intersil |
| 文件页数： | 34/39页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 48-QFN |
| 标准包装： | 43 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.99 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 管件 |
| 产品目录页面： | 1248 (CN2011-ZH PDF) |
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ISL6322G
Compensation
The two opposing goals of compensating the voltage
regulator are stability and speed. The regulated converter is
accurately modeled 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 23,
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 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.
C 2
In Equation 36, 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 P-P is the
peak-to-peak sawtooth signal amplitude as described in
Output Filter Design
The output inductors and the output capacitor bank together
to form a low-pass filter responsible for smoothing the
pulsating voltage at the phase nodes. The output filter also
must provide the transient energy until the regulator can
respond. Because it has a low bandwidth compared to the
switching frequency, the output filter limits the system
transient response. The output capacitors must supply or
sink load current while the current in the output inductors
increases or decreases to meet the demand.
In high-speed converters, the output capacitor bank is usually
the most costly (and often the largest) part of the circuit.
Output filter design begins with minimizing the cost of this part
of the circuit. The critical load parameters in choosing the
R C
C C
COMP
output capacitors are the maximum size of the load step, Δ I,
the load-current slew rate, di/dt, and the maximum allowable
output-voltage deviation under transient loading, Δ V MAX .
FB
Capacitors are characterized according to their capacitance,
C 1
R 1
ISL6322G
R FB
VDIFF
FIGURE 22. COMPENSATION CIRCUIT
ESR, and ESL (equivalent series inductance).
At the beginning of the load transient, the output capacitors
supply all of the transient current. The output voltage will
initially deviate by an amount approximated by the voltage
drop across the ESL. As the load current increases, the
voltage drop across the ESR increases linearly until the load
current reaches its final value. The capacitors selected must
have sufficiently low ESL and ESR so that the total
In the solutions to the compensation equations, there is a
single degree of freedom. For the solutions presented in
Equation 36, R FB is selected arbitrarily. The remaining
compensation components are then selected according to
output-voltage deviation is less than the allowable maximum.
Neglecting the contribution of inductor current and regulator
response, the output voltage initially deviates by the amount
specified in Equation 37.
R 1 = R FB ? --------------------------------------------
Δ V ≈ ESL ? ----- + ESR ? Δ I
Equation 36.
C ? ESR
L ? C – C ? ESR
di
dt
(EQ. 37)
The filter capacitor must have sufficiently low ESL and ESR
C 1 = --------------------------------------------
( 2 ? π ) 2 ? f 0 ? f HF ? ( L ? C ) ? R FB ? V P-P
V PP ? ? 2 π ? ? f 0 ? f HF ? L ? C ? R FB
R C = -----------------------------------------------------------------------------------------
L ? C – C ? ESR
R FB
V IN
C 2 = -----------------------------------------------------------------------------------------------------
2
? ?
V IN ? ( 2 ? π ? f HF ? L ? C – 1 )
so that Δ V < Δ V MAX .
Most capacitor solutions rely on a mixture of high-frequency
capacitors with relatively low capacitance in combination
with bulk capacitors having high capacitance but limited
high-frequency performance. Minimizing the ESL of the
high-frequency capacitors allows them to support the output
voltage as the current increases. Minimizing the ESR of the
bulk capacitors allows them to supply the increased current
with less output voltage deviation.
( 2 ? π ) 2 ? f 0 ? f HF ? ( L ? C ) ? R FB ? V P-P
V IN ? ( 2 ? π ? f HF ? L ? C – 1 )
C C = -----------------------------------------------------------------------------------------------------
34
(EQ. 36)
The ESR of the bulk capacitors also creates the majority of
the output-voltage ripple. As the bulk capacitors sink and
source the inductor ac ripple current (see “Interleaving” on
FN6715.0
May 22, 2008
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相关代理商/技术参数 |
参数描述 |
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| ISL6322GCRZ-T | 功能描述:IC CTRLR PWM BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6322GIRZ | 功能描述:IC CTRLR PWM BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6322GIRZ-T | 功能描述:IC CTRLR PWM BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6322IRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6322IRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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