参数资料
| 型号： | HIP6302CB |
| 厂商： | Intersil |
| 文件页数： | 11/16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
R IN
R FB
C c
FB
COMP
HIP6302
V IN
ERROR
AMPLIFIER
-
SAWTOOTH
GENERATOR
CORRECTION
+
COMPARATOR
-
+
PWM
CIRCUIT
PWM
HIP6601
Q1
L 01
I L
V CORE
+
-
Q2
PHASE
REFERENCE
DAC
DIFFERENCE
+
CURRENT
I SEN
R ISEN
SENSING
-
ONLY ONE OUTPUT
TO OTHER
CHANNELS
AVERAGING
CURRENT
SENSING
FROM
OTHER
CHANNEL
STAGE SHOWN
INDUCTOR
CURRENT
TO OVER
CURRENT
TRIP
+
-
COMPARATOR
REFERENCE
FROM
OTHER
CHANNEL
FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
Current Sensing and Balancing
Overview
The HIP6302 samples the on-state voltage drop across each
synchronous rectifier FET, Q2, as an indication of the
inductor current in that phase, see Figure 7. Neglecting AC
effects (to be discussed later), the voltage drop across Q2 is
simply r DS(ON) (Q2) x inductor current (I L ). Note that I L , the
inductor current, is 1/2 of the total current (I LT ).
The voltage at Q2’s drain, the PHASE node, is applied to the
R ISEN resistor to develop the I ISEN current to the HIP6302
ISEN pin. This pin is held at virtual ground, so the current
through R ISEN is I L x r DS(ON) (Q2) / R ISEN .
The I ISEN current provides information to perform the
following functions:
1. Detection of an over-current condition
2. Reduce the regulator output voltage with increasing load
current (droop)
3. Balance the I L currents in the two phases
Over-Current, Selecting R ISEN
The current detected through the R ISEN resistor is averaged
with the current detected in the other channel. The averaged
11
current is compared with a trimmed, internally generated
current, and used to detect an over-current condition.
The nominal current through the R ISEN resistor should be
50 μ A at full output load current, and the nominal trip point for
over-current detection is 165% of that value, or 82.5 μ A.
Therefore, R ISEN = I L x r DS(ON) (Q2)/50 μ A.
For a full load of 25A per phase, and an r DS(ON) (Q2) of
4m ? , R ISEN = 2k ? .
The over-current trip point would be 165% of 25A, or ~ 41A
per phase. The R ISEN value can be adjusted to change the
over-current trip point, but it is suggested to stay within ± 25%
of nominal.
Droop, Selection of R IN
The average of the currents detected through the R ISEN
resistors is also steered to the FB pin. There is no DC return
path connected to the FB pin except for R IN , so the average
current creates a voltage drop across R IN . This drop
increases the apparent V CORE voltage with increasing load
current, causing the system to decrease V CORE to maintain
balance at the FB pin. This is the desired “droop” voltage
used to maintain V CORE within limits under transient
conditions.
FN4766.3
December 27, 2004
相关PDF资料 |
PDF描述 |
|---|---|
| HIP6302VCB-T | IC REG CTRLR BUCK PWM 16-SOIC |
| HIP6303CB-T | IC REG CTRLR BUCK PWM 20-SOIC |
| HIP6311ACB-T | IC REG CTRLR BUCK PWM 20-SOIC |
| HIP6311CB-T | IC REG CTRLR BUCK PWM 20-SOIC |
| HIP6501ACB-T | IC PWM TRIPLE POWER CTRLR 16SOIC |
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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