参数资料
| 型号： | ISL6324AIRZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/40页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID CTRLR PWM DUAL 48QFN |
| 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) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
ISL6324A
switching frequency set by the resistor between the FS pin
and ground. The PWM signals command the MOSFET
Equation 5 shows the S-domain equivalent voltage, V L ,
across the inductor.
V L ( s ) = I L ? ( s ? L + DCR )
driver to turn on/off the channel MOSFETs.
For 4-channel operation, the channel firing order is 1-2-3-4:
n
(EQ. 5)
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 1-2-3.
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
across the sense capacitor, V C , can be shown to be
proportional to the channel current I Ln , shown in Equation 6.
? ------------- + 1 ?
-------------------------------------------------------- ? K ? DCR ? I L
? ( R 1 ? R 2 ) ?
Connecting ISEN4- to VCC selects three channel operation
and the pulse times are spaced in 1/3 cycle increments. If
ISEN3- is also connected to VCC, 2-Channel operation is
selected and the PWM2 pulse happens 1/2 of a cycle after
PWM1 pulse. If ISEN2- is also connected to VCC, 1-
Channel operation is selected.
V C ( s ) =
Where:
s ? L
? DCR ?
? s ? ------------------------ ? C + 1 ?
? R 1 + R 2 ?
n
(EQ. 6)
R 2
Continuous Current Sampling
In order to realize proper current-balance, the currents in
K = ---------------------
R 2 + R 1
(EQ. 7)
each channel are sampled continuously every switching
cycle. During this time, the current-sense amplifier uses the
V IN
IL
n
ISEN inputs to reproduce a signal proportional to the
inductor current, I L . This sensed current, I SEN , is simply a
MOSFET
UGATE(n)
L
DCR
V OUT
scaled version of the inductor current.
DRIVER
LGATE(n)
INDUCTOR
V L (s)
C OUT
V C (s)
R 1
C
PWM
SWITCHING PERIOD
I L
ISL6323 INTERNAL CIRCUIT
I n
SAMPLE
R 2
I SEN
+
-
V C (s)
ISENn-
TIME
FIGURE 4. CONTINUOUS CURRENT SAMPLING
I SEN
R ISEN
ISENn+
VCC
RSET
R SET
The ISL6324A supports Inductor DCR current sensing to
L R 1 ? R
R 1 + R 2
continuously sample each channel’s current for channel-current
balance. The internal circuitry, shown in Figure 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 how many channels are operating.
Inductor windings have a characteristic distributed
resistance or DCR (Direct Current Resistance). For
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 6. The channel current
I Ln , flowing through the inductor, passes through the DCR.
14
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.
2
------------- = -------------------- ? C (EQ. 8)
DCR
The capacitor voltage V C , is then replicated across the
effective internal sense resistor, R ISEN . This develops a
FN6880.2
May 14, 2010
相关PDF资料 |
PDF描述 |
|---|---|
| LT1118CS8#PBF | IC REG LDO ADJ .8A 8SOIC |
| ISL6324IRZ-T | IC HYBRID CTRLR PWM DUAL 48-QFN |
| LT1963AET-3.3#PBF | IC REG LDO 3.3V 1.5A TO220-5 |
| HIP6004BCVZA-T | IC CTRLR PWM VOLTAGE MON 20TSSOP |
| RYM28DTMT-S189 | CONN EDGECARD 56POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6324AIRZ-TR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONTROLLER, CORE + NORTHBRIDGE, PROG PSI, 3.4MHZ S - Tape and Reel 制造商:Intersil Corporation 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN |
| ISL6324CRZ | 功能描述:IC HYBRID CTRLR PWM DUAL 48-QFN 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 |
| ISL6324CRZ-T | 功能描述:IC HYBRID CTRLR PWM DUAL 48-QFN 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 |
| ISL6324IRZ | 功能描述:IC HYBRID CTRLR PWM DUAL 48-QFN 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 |
| ISL6324IRZ-T | 功能描述:IC HYBRID CTRLR PWM DUAL 48-QFN 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 |
发布紧急采购，3分钟左右您将得到回复。