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參數(shù)資料
| 型號： | HIP6302CBZ |
| 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, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MS-012-AC, SOIC-16 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 387K |
| 代理商： | HIP6302CBZ |
11
FN4766.3
December 27, 2004
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
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
balance at the FB pin. This is the desired “droop” voltage
used to maintain V
CORE
within limits under transient
conditions.
FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
AVERAGING
CURRENT
SENSING
FROM
OTHER
CHANNEL
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
FROM
OTHER
CHANNEL
PWM
I
L
HIP6302
C
O
R
L
V
IN
ONLY ONE OUTPUT
STAGE SHOWN
HIP6601
-
-
-
+
-
+
-
+
HIP6302
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| HIP6302CBZA | 功能描述:電流型 PWM 控制器 W/ANNEAL TWO PHS SYNCH BUCK CNTRLR RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| HIP6302CBZA-T | 功能描述:電流型 PWM 控制器 TWO PHS SYNCH BUCK CNTRLR VRM 9 X RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| HIP6302CBZ-T | 功能描述:電流型 PWM 控制器 VER OF HIP6302CB-T RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| HIP6302EVAL1 | 功能描述:電源管理IC開發(fā)工具 HIP6302 EVAL BRD FOR 45A ATHLON RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| HIP6302V | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
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