参数资料
| 型号： | ISL6323IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID CTRLR PWM MONO 48-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 2 |
| 输出电压： | 最高 2V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 带卷 (TR) |
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ISL6323
ground. The PWM signals command the MOSFET driver to
turn on/off the channel MOSFETs.
across the sense capacitor, V C , can be shown to be
proportional to the channel current I Ln , shown in Equation 6.
? ------------- + 1 ?
( R 1 ? R 2 )
V C ( s ) = -------------------------------------------------------- ? K ? DCR ? I L
R 1 + R 2
R 2
R 2 + R 1
For 4-channel operation, the channel firing order is 4-3-2-1:
PWM3 pulse happens 1/4 of a cycle after PWM4, PWM2
output follows another 1/4 of a cycle after PWM3, and
PWM1 delays another 1/4 of a cycle after PWM2. For
3-channel operation, the channel firing order is 3-2-1.
Connecting ISEN4- to VCC selects 3-channel operation and
the pulse times are spaced in 1/3 cycle increments. If ISEN3- is
connected to VCC, 2-channel operation is selected and the
s ? L
? DCR ?
? ?
? s ? ------------------------ ? C + 1 ?
? ?
Where:
K = ---------------------
n
(EQ. 6)
(EQ. 7)
PWM2 pulse happens 1/2 of a cycle after PWM1 pulse.
Continuous Current Sampling
In order to realize proper current-balance, the currents in
each channel are sampled continuously every switching
MOSFET
UGATE(n)
V IN
L
I
L
n
DCR
V OUT
cycle. During this time, the current-sense amplifier uses the
ISEN inputs to reproduce a signal proportional to the
inductor current, I L . This sensed current, I SEN , is simply a
scaled version of the inductor current.
DRIVER
LGATE(n)
INDUCTOR
V L (s)
V C (s)
R 1
C
C OUT
ISL6323 INTERNAL CIRCUIT
R 2
PWM
SWITCHING PERIOD
I n
SAMPLE
I L
+
-
V C (s)
R ISEN
ISENn-
ISENn+
I SEN
I SEN
TO ACTIVE
CORE CHANNELS
{
VCC
RSET
TO NORTH BRIDGE
R SET
TIME
FIGURE 4. CONTINUOUS CURRENT SAMPLING
The ISL6323 supports Inductor DCR current sensing to
continuously sample each channel’s current for channel-current
balance. The internal circuitry, shown in Figure 5 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 how many channels are operating.
C SET
FIGURE 5. INDUCTOR DCR CURRENT SENSING
CONFIGURATION
If the R-C network components are selected such that the
RC time constant matches the inductor L/DCR time constant
(see Equation 8), then V C is equal to the voltage drop across
the DCR multiplied by the ratio of the resistor divider, K. If a
resistor divider is not being used, the value for K is 1.
L R 1 ? R
R 1 + R 2
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
------------- = -------------------- 2 - ? C
DCR
(EQ. 8)
V L ( s ) = I L ? ( s ? L + DCR )
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 5. The channel current
I Ln , flowing through the inductor, passes through the DCR.
Equation 5 shows the S-domain equivalent voltage, V L ,
across the inductor.
(EQ. 5)
n
A simple R-C network across the inductor (R 1 , R 2 and C)
extracts the DCR voltage, as shown in Figure 6. The voltage
14
The capacitor voltage V C , is then replicated across the effective
internal sense resistor, R ISEN . This develops a current through
R ISEN which is proportional to the inductor current. This
current, I SEN , is continuously sensed and is then used by the
controller for load-line regulation, channel-current balancing,
and overcurrent detection and limiting. Equation 9 shows that
the proportion between the channel current, I L , and the sensed
current, I SEN , is driven by the value of the effective sense
resistance, R ISEN , and the DCR of the inductor.
FN9278.5
May 17, 2011
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| ISL6324ACRZ | 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6324ACRZR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONTROLLER, CORE+NORTHBRIDGE, PROG PSI, 3.4MHZ SVI - Rail/Tube 制造商:Intersil Corporation 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN |
| ISL6324ACRZ-T | 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6324ACRZ-TR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONT., CORE + NORTHBRIDGE, PROG PSI, 3.4MHZ SVI, 5 - Tape and Reel 制造商:Intersil Corporation 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN |
| ISL6324AIRZ | 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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