参数资料
| 型号： | HIP6303CB-T |
| 厂商： | Intersil |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-SOIC |
| 标准包装： | 1,000 |
| PWM 型： | 控制器 |
| 输出数： | 4 |
| 频率 - 最大： | 350kHz |
| 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： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
HIP6303
R IN
R FB
C c
FB
COMP
HIP6303
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
CHANNELS
STAGE SHOWN
INDUCTOR
CURRENT(S)
FROM
OTHER
TO OVER
CURRENT
TRIP
+
-
COMPARATOR
REFERENCE
CHANNELS
FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
Current Sensing and Balancing
Overview
The HIP6303 samples the on-state voltage drop across each
synchronous recti?er FET, Q2, as an indication of the
inductor current in that channel, 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 either 1/2, 1/3, or 1/4 of the total current
(I LT ), depending on how many channels are active.
The voltage at Q2’s drain, the PHASE node, is applied to the
R ISEN resistor to develop the I ISEN current to the HIP6303
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 multiple channels
11
Over-Current, Selecting R ISEN
The current detected through the R ISEN resistor is averaged
with the current(s) detected in the other 1, 2, or 3 channels.
The averaged 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 channel, and an r DS(ON) (Q2) of
4m ? , R ISEN = 2k ? .
The over-current trip point would be 165% of 25A, or ~ 41A
per channel. The R ISEN value can be adjusted to change the
over-current trip point, but it is suggested to stay within ± 25%
of nominal.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HIP6303EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| HIP6304 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| HIP6304 WAF | 制造商:Intersil Corporation 功能描述: |
| HIP6304CB | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| HIP6304CB-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel 制造商:Intersil Corporation 功能描述: |
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