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參數(shù)資料
| 型號(hào)： | ISL6564ACRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Multiphase PWM Controller with Linear 6-Bit DAC Capable of Precision rDS(ON) or DCR Differential Current Sensing |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, MO-220, QFN-40 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 636K |
| 代理商： | ISL6564ACRZ |
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13
FN6285.1
March 20, 2007
Current Sensing
The ISL6564A supports inductor DCR sensing, MOSFET
r
DS(ON)
sensing, or resistive sensing techniques. The
internal circuitry, shown in Figures 4, 5, and 6, represents
channel n of an N-channel converter. This circuitry is
repeated for each channel in the converter, but may not be
active depending on the status of the PWM3 and PWM4
pins, as described in the
PWM Operation
section.
INDUCTOR DCR SENSING
An inductor’s winding is characteristic of a distributed
resistance as measured by the DCR (Direct Current
Resistance) parameter. Consider the inductor DCR as a
separate lumped quantity, as shown in Figure 4. The
channel current I
L
, flowing through the inductor, will also
pass through the DCR. Equation 4 shows the s-domain
equivalent voltage across the inductor V
L
.
A simple R-C network across the inductor extracts the DCR
voltage, as shown in Figure 4.
The voltage on the capacitor V
C
, can be shown to be
proportional to the channel current I
L
, see Equation 5.
If the R-C network components are selected such that the
RC time constant matches the inductor L/DCR time
constant, then V
C
is equal to the voltage drop across the
DCR.
The capacitor voltage V
C
, is then replicated across the
sense resistor R
ISEN
. The current through the sense resistor
is proportional to the inductor current. Equation 6 shows the
proportion between the channel current and the sensed
current I
SEN
, is driven by the value of the sense resistor
chosen and the DCR of the inductor.
DCR varies with temperature, so a Positive Temperature
Coefficient (PTC) resistor should be selected for the sense
resistor R
ISEN
.
RESISTIVE SENSING
If DCR sensing is not utilized, independent current-sense
resistors in series with each output inductor can serve as the
sense element (see Figure 5). This technique is more
accurate, but reduces overall converter efficiency due to the
addition of a lossy element directly in the output path.
FIGURE 3. SAMPLE AND HOLD TIMING
TIME
PWM
I
L
SWITCHING PERIOD
I
SEN
t
HOLD
SAMPLE CURRENT, I
n
V
L
I
L
s L
DCR
+
(
)
=
(EQ. 4)
V
C
s
-------------
1
+
--------------------------------------------------------------------
DCR I
L
(
)
+
(
=
(EQ. 5)
FIGURE 4. DCR SENSING CONFIGURATION
I
n
I
SEN
I
L
R
ISEN
-----------------
=
-
+
ISEN-(n)
SAMPLE
&
HOLD
ISL6564A INTERNAL CIRCUIT
V
IN
ISEN+(n)
PWM(n)
ISL6207
R
ISEN(n)
(PTC)
DCR
L
INDUCTOR
R
V
OUT
C
OUT
-
+V
C
(s)
C
ILs
( )
-
+
V
L
I
SEN
I
L
ISEN
-----------------
=
(EQ. 6)
ISL6564A
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| ISL6564AIRZ | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:是 類別: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 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 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) |
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