参数资料
| 型号： | HIP6302CB |
| 厂商： | Intersil |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-SOIC |
| 标准包装： | 48 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 305kHz |
| 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
HIP6302
With a high dv/dt load transient, typical of high performance
microprocessors, the largest deviations in output voltage
occur at the leading and trailing edges of the load transient. In
order to fully utilize the output-voltage tolerance range, the
output voltage is positioned in the upper half of the range
when the output is unloaded and in the lower half of the range
when the controller is under full load. This droop
compensation allows larger transient voltage deviations and
25
20
15
10
thus reduces the size and cost of the output filter components.
5
R IN should be selected to give the desired “droop” voltage at
the normal full load current 50 μ A applied through the R ISEN
resistor (or at a different full load current if adjusted as under
“Over-Current, Selecting R ISEN ” above).
R IN = Vdroop / 50 μ A
For a Vdroop of 80mV, R IN = 1.6k ?
The AC feedback components, R FB and Cc, are scaled in
relation to R IN .
Current Balancing
The detected currents are also used to balance the phase
currents.
Each phase’s current is compared to the average of the two
phase currents, and the difference is used to create an offset
in that phase’s PWM comparator. The offset is in a direction
to reduce the imbalance.
The balancing circuit can not make up for a difference in
r DS(ON) between synchronous rectifiers. If a FET has a
higher r DS(ON) , the current through that phase will be
reduced.
Figures 8 and 9 show the inductor current of a two phase
system without and with current balancing.
Inductor Current
The inductor current in each phase of a multi-phase Buck
converter has two components. There is a current equal to
the load current divided by the number of phases (I LT / n),
and a sawtooth current, (i PK-PK ) resulting from switching.
The sawtooth component is dependent on the size of the
inductors, the switching frequency of each phase, and the
values of the input and output voltage. Ignoring secondary
effects, such as series resistance, the peak to peak value of
the sawtooth current can be described by:
i PK-PK = (V IN x V CORE - V CORE2 ) / (L x F SW x V IN )
Where: V CORE = DC value of the output or V ID voltage
V IN = DC value of the input or supply voltage
0
FIGURE 8. TWO CHANNEL MULTIPHASE SYSTEM WITH
CURRENT BALANCING DISABLED
25
20
15
10
5
0
FIGURE 9. TWO CHANNEL MULTIPHASE SYSTEM WITH
CURRENT BALANCING ENABLED
The inductor, or load current, flows alternately from V IN
through Q1 and from ground through Q2. The HIP6302
samples the on-state voltage drop across each Q2 transistor
to indicate the inductor current in that phase. The voltage
drop is sampled 1/3 of a switching period, 1/F SW , after Q1 is
turned OFF and Q2 is turned on. Because of the sawtooth
current component, the sampled current is different from the
average current per phase. Neglecting secondary effects,
the sampled current (I SAMPLE ) can be related to the load
current (I LT ) by:
I SAMPLE = I LT / n + (V IN V CORE - 3V CORE2 ) / (6L x F SW x V IN )
L = value of the inductor
F SW = switching frequency
Where: I LT
= total load current
n = the number of channels
Example: For V CORE = 1.6V,
Example: Using the previously given conditions, and
V IN = 12V,
For I LT
= 50A,
L = 1.3 μ H,
F SW = 250kHz,
Then i PK-PK = 4.3A
12
n =2
Then I SAMPLE = 25.49A
FN4766.3
December 27, 2004
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HIP6302CB-T | 功能描述:电流型 PWM 控制器 MPU CORE Volt Reg 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 |
| HIP6302CB-TS2495 | 制造商:Intersil Corporation 功能描述:SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO16 |
| HIP6302CBZ | 功能描述:电流型 PWM 控制器 VER OF HIP6302CB 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 |
| HIP6302CBZA | 功能描述:电流型 PWM 控制器 W/ANNEAL TWO PHS SYNCH BUCK CNTRLR 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 |
| HIP6302CBZA-T | 功能描述:电流型 PWM 控制器 TWO PHS SYNCH BUCK CNTRLR VRM 9 X 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 |
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