参数资料
| 型号： | ISL6308ACRZ |
| 厂商： | Intersil |
| 文件页数： | 21/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 3PHASE 40-QFN |
| 标准包装： | 500 |
| 应用： | 控制器，DDR |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 2.3 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
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ISL6308A
initial load transient spike, as shown in Figure 18. Follow the
steps below to ensure the R-C and inductor L/DCR time
constants are matched accurately.
C 2 (OPTIONAL)
1. Capture a transient event with the oscilloscope set to
about L/DCR/2 (sec/div). For example, with L = 1μH and
R 2
C 1
COMP
DCR = 1m Ω , set the oscilloscope to 500μs/div.
2. Record Δ V1 and Δ V2 as shown in Figure 18.
3. Select a new value, R COMP,2 , for the time constant
resistor based on the original value, R COMP,1 , using
Equation 27.
R 1
FB
ISL6308A
R COMP , 2 = R COMP , 1 ? ----------
Δ V
Δ V 1
2
(EQ. 27)
VDIFF
4. Replace R COMP with the new value and check to see that
the error is corrected. Repeat the procedure if necessary.
After choosing a new value for R COMP , it will most likely be
necessary to adjust the value of R S to obtain the desired full
load droop voltage. Use Equation 26 to obtain the new value
for R S .
Compensation
The two opposing goals of compensating the voltage
regulator are stability and speed. Depending on whether the
regulator employs the optional load-line regulation, as
there are two distinct methods for achieving these goals.
Compensating the Load-Line Regulated Converter
The load-line regulated converter behaves in a similar
manner to a peak current mode controller because the two
poles at the output filter L-C resonant frequency split with the
introduction of current information into the control loop. The
final location of these poles is determined by the system
function, the gain of the current signal, and the value of the
compensation components, R 2 and C 1 .
FIGURE 19. COMPENSATION CONFIGURATION FOR
LOAD-LINE REGULATED ISL6308A CIRCUIT
Since the system poles and zero are affected by the values
of the components that are meant to compensate them, the
solution to the system equation becomes fairly complicated.
Fortunately, there is a simple approximation that comes very
close to an optimal solution. Treating the system as though it
were a voltage-mode regulator, by compensating the L-C
poles and the ESR zero of the voltage mode approximation,
yields a solution that is always stable with very close to ideal
transient performance.
The feedback resistor, R 1 , has already been chosen as
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 double pole frequency and the ESR zero
frequency. For each of the following three, there is a
separate set of equations for the compensation components.
--------------------------- > F 0
Case 1:
1
2 π ? L ? C
R 2 = R 1 ? ------------------------------------------------------------
0.66 ? V
2 π ? V OSC ? R 1 ? f 0
Δ V 1
Δ V 2
V OUT
2 π ? F 0 ? V OSC ? L ? C
IN
0.66 ? V IN
C 1 = -------------------------------------------------
--------------------------- ≤ F 0 < ---------------------------------
I TRAN
Case 2:
1 1
2 π ? L ? C 2 π ? C ? ESR
V OSC ? ( 2 π ) 2 ? F 0 ? L ? C
Δ I
2
0.66 ? V
R 2 = R 1 ? ----------------------------------------------------------------
IN
(EQ. 28)
C 1 = --------------------------------------------------------------------------------
( 2 π ) ? F 0 ? V OSC ? R 1 ? L ? C
FIGURE 18. TIME CONSTANT MISMATCH BEHAVIOR
21
2
0.66 ? V IN
FN6669.0
September 9, 2008
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相关代理商/技术参数 |
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| ISL6308ACRZR5609 | 制造商:Intersil Corporation 功能描述:PB-FREE DAC-LESS MULTI-PHASE PWM CONTR W/3-DRIVERS, HARD WI - Rail/Tube |
| ISL6308ACRZ-T | 功能描述:IC CTRLR PWM BUCK 3PHASE 40-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 |
| ISL6308ACRZ-TR5609 | 制造商:Intersil Corporation 功能描述:PB-FREE DAC-LESS MULTI-PHASE PWM CONTR W/3-DRIVERS, HARD WIR - Tape and Reel |
| ISL6308AEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL6308A RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6308AIRZ | 功能描述:IC CTRLR PWM BUCK 3PHASE 40-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 |
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