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參數(shù)資料
| 型號(hào)： | HIP6311CBZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | LEAD FREE, PLASTIC, MS-013-AC, SOIC-20 |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大?。?/td> | 449K |
| 代理商： | HIP6311CBZ |
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11
FN4817.3
December 27, 2004
Current Sensing and Balancing
Overview
The HIP6311 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 either 1/2, 1/3, or 1/4 of the total current
(I
LT
), depending on how many phases are in use.
The voltage at Q2’s drain, the PHASE node, is applied to the
R
ISEN
resistor to develop the I
ISEN
current to the HIP6311
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
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 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
FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
AVERAGING
CURRENT
SENSING
FROM
OTHER
CHANNELS
SAWTOOTH
GENERATOR
+
DIFFERENCE
R
ISEN
+
CORRECTION
ERROR
AMPLIFIER
FB
COMP
REFERENCE
DAC
TO OTHER
CHANNELS
I
SEN
R
IN
R
FB
C
c
V
CORE
Q1
Q2
COMPARATOR
REFERENCE
TO OVER
CURRENT
TRIP
L
01
PHASE
INDUCTOR
CURRENT(S)
FROM
OTHER
CHANNELS
PWM
I
L
HIP6311
C
O
R
L
V
IN
ONLY ONE OUTPUT
STAGE SHOWN
HIP6601
-
-
-
+
-
+
-
+
HIP6311
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HIP6311CBZA | 功能描述:電流型 PWM 控制器 W/ANL 2-4 PHS SYNCH BUCK CNTRLR 0 8%F RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| HIP6311CBZA-T | 功能描述:電流型 PWM 控制器 W/ANL 2-4 PHS SYNCH BUCK CNTRLR 0 8%F RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| HIP6311CBZ-T | 功能描述:電流型 PWM 控制器 2-4 PHS SYNCH BUCK CNTRLR 0 8%REF TAPE RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| HIP6311VCB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HIP6312VACB | 制造商:Intersil Corporation 功能描述: |
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