参数资料
| 型号： | ISL6333IRZ |
| 厂商： | Intersil |
| 文件页数： | 21/40页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 3PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 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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ISL6333, ISL6333A, ISL6333B, ISL6333C
Continuous Current Sensing
In order to realize proper current-balance, the currents in
each channel are sensed continuously every switching
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.
The controllers support inductor DCR current sensing to
continuously sense each channel’s current for channel-current
The capacitor voltage V C , is then replicated across the
effective internal sense resistance, 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 controllers for load-line regulation,
channel-current balancing, and overcurrent detection and
limiting. Equation 6 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.
I SEN = I L ? ------------------
R
balance. The internal circuitry, shown in Figure 6 represents
one channel of the controller. This circuitry is repeated for each
DCR
ISEN
(EQ. 6)
channel in the converter, but may not be active depending on
how many channels are operating.
The effective internal R ISEN resistance is important to the
current sensing process because it sets the gain of the load
V IN
I
L
line regulation loop as well as the gain of the channel-current
R ISEN = ---------- ? R SET
MOSFET
DRIVER
I n
UGATE
LGATE
ISL6333 INTERNAL
L
DCR
INDUCTOR
V L (s)
V C (s)
R 1
C 1
V OUT
C OUT
balance loop and the overcurrent trip level. The effective
internal R ISEN resistance is user programmable and is set
through use of the R SET pin. Placing a single resistor, R SET ,
from the R SET pin to the VCC pin programs the effective
internal R ISEN resistance according to Equation 7.
3
(EQ. 7)
400
The current sense circuitry operates in a very similar manner
SENSE
CIRCUIT
for negative current feedback, where inductor current is
flowing from the output of the regulator to the PHASE node,
opposite of flow pictured in Figure 6. However, the range of
+
-
V C (s)
R ISEN
ISEN-
ISEN+
proper operation with negative current sensing is limited to
~60% of full positive current OCP threshold. Care should be
taken to avoid operation with negative current feedback
exceeding this threshold, as this may lead to momentary
I SEN
RSET
loss of current balance between phases and disruption of
R SET
FIGURE 6. INDUCTOR DCR CURRENT SENSING
CONFIGURATION
VCC
normal circuit operation.
Output Voltage Setting
The controllers use a digital to analog converter (DAC) to
generate a reference voltage based on the logic signals at
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 L , flowing through the inductor, passes through the DCR.
Equation 4 shows the S-domain equivalent voltage, V L ,
the VID pins. The DAC decodes the logic signals into one of
the discrete voltages shown in Table 2. Each VID pin is
pulled up to an internal 1.2V voltage by a weak current
source (40μA), which decreases to 0A as the voltage at the
VID pin varies from 0 to the internal 1.2V pull-up voltage.
External pull-up resistors or active-high output stages can
across the inductor.
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 4)
augment the pull-up current sources, up to a voltage of 5V.
TABLE 2. VR11 VOLTAGE IDENTIFICATION CODES
? ------------- + 1 ?
s ? L
? DCR
?
V C ( s ) = ----------------------------------------- ? DCR ? I L
A simple R-C network across the inductor (R 1 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 L , shown in Equation 5.
(EQ. 5)
( s ? R 1 ? C 1 + 1 )
If the R 1 -C 1 network components are selected such that their
time constant matches the inductor L/DCR time constant, then
V C is equal to the voltage drop across the DCR.
VID7
0
0
0
0
0
0
0
VID6
0
0
0
0
0
0
0
VID5
0
0
0
0
0
0
0
VID4
0
0
0
0
0
0
0
VID3
0
0
0
0
0
0
0
VID2
0
0
0
0
1
1
1
VID1
0
0
1
1
0
0
1
VID0
0
1
0
1
0
1
0
VDAC
OFF
OFF
1.60000
1.59375
1.58750
1.58125
1.57500
21
FN6520.3
October 8, 2010
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| ISL6334AIRZR5368 | IC CTRLR PWM 4PHASE BUCK 40QFN |
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相关代理商/技术参数 |
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| ISL6333IRZ-T | 功能描述:IC CTRLR PWM 3PHASE BUCK 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 |
| ISL6334ACRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 40-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 |
| ISL6334ACRZR5368 | 功能描述:IC CTRLR PWM 4PHASE BUCK 40QFN 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 |
| ISL6334ACRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 40-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 |
| ISL6334ACRZ-TR5368 | 功能描述:IC CTRLR PWM 4PHASE BUCK 40QFN 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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