參數(shù)資料
型號(hào)： ISL6553CB-T
廠(chǎng)商： INTERSIL CORP
元件分類(lèi)： 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： PLASTIC, MS-012-AC, SOIC-16
文件頁(yè)數(shù)： 10/15頁(yè)
文件大?。?/td> 182K
代理商： ISL6553CB-T
10
Current Sensing and Balancing
Overview
The ISL6553 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 ISL6553
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
to maintain
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
ISEN
R
IN
R
FB
C
c
V
CORE
Q1
Q2
COMPARATOR
REFERENCE
TO OVER
CURRENT
TRIP
L
PHASE
INDUCTOR
CURRENT
FROM
OTHER
CHANNEL
PWM
I
L
ISL6553
C
O
R
L
V
IN
ONLY ONE OUTPUT
STAGE SHOWN
HIP6601
-
-
-
+
-
+
-
+
ISL6553
相關(guān)PDF資料
PDF描述
ISL6553EVAL1 Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
ISL6554 PWM Controller with Wide Input Range 8-PDIP
ISL6554CB-T Microprocessor CORE Voltage Regulator Using Multi-Phase Buck PWM Control Without Programmable Droop
ISL6554CB Microprocessor CORE Voltage Regulator Using Multi-Phase Buck PWM Control Without Programmable Droop
ISL6554CBZ Microprocessor CORE Voltage Regulator Using Multi-Phase Buck PWM Control Without Programmable Droop
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6553CBZ 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR)
ISL6553CBZA 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR)
ISL6553CBZA-T 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR)
ISL6553CBZ-T 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR)
ISL6553EVAL1 功能描述:EVALUATION BOARD ISL6553 RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線(xiàn)）SMPS 系列:Endura™ 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類(lèi)型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類(lèi)型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
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