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參數資料
| 型號： | HIP6311ACBZA |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | XCV150-5BGG352I - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | LEAD FREE, PLASTIC, MS-013-AC, SOIC-20 |
| 文件頁數： | 11/16頁 |
| 文件大小： | 449K |
| 代理商： | HIP6311ACBZA |
11
Current Sensing and Balancing
Overview
The HIP6311A 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 HIP6311A
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 gener-
ated 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.
With a high dv/dt load transient, typical of high performance
microprocessors, the largest deviations in output voltage
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
HIP6311A
C
O
R
L
V
IN
ONLY ONE OUTPUT
STAGE SHOWN
HIP6601
-
-
-
+
-
+
-
+
HIP6311A
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相關代理商/技術參數 |
參數描述 |
|---|---|
| HIP6311ACBZA-T | 功能描述:電流型 PWM 控制器 W/ANNEAL C4AM MULTI- PHS CONTR 5% AC RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| HIP6311ACBZ-T | 功能描述:電流型 PWM 控制器 C4AM MULTI-PHS CONTR VID LVLS 5% AC RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| HIP6311CB | 功能描述:IC REG CTRLR BUCK PWM 20-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| HIP6311CB-T | 功能描述:IC REG CTRLR BUCK PWM 20-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| HIP6311CBZ | 功能描述:電流型 PWM 控制器 2-4 PHS SYNCH BUCK CNTRLR 0 8%F RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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