参数资料
| 型号： | ISL6310CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 11/27页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 2PHASE BUCK 32-QFN |
| 标准包装： | 6,000 |
| 应用： | 控制器，DDR |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 2.3 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 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页当前第11页第12页第13页第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
ISL6310
I n = I L ? ----------------------
transition low. 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 sample window
opens exactly 1/6 of the switching period, t SW , after the
PWM transitions low. The sample window then stays open
the rest of the switching cycle until PWM transitions high
again, as illustrated in Figure 4.
The sampled current, at the end of the t SAMPLE , is
proportional to the inductor current and is held until the next
switching period sample. The sampled current is used only
for channel current balance.
I L
PWM
SWITCHING PERIOD
I SEN
SAMPLING PERIOD
The ISL6310 senses the channel load current by sampling
the voltage across the lower MOSFET r DS(ON) , as shown in
Figure 5. A ground-referenced operational amplifier, internal
to the ISL6310, is connected to the PHASE node through a
resistor, R ISEN . The voltage across R ISEN is equivalent to
the voltage drop across the r DS(ON) of the lower MOSFET
while it is conducting. The resulting current into the ISEN pin
is proportional to the channel current, I L . The ISEN current is
derived where I L is the channel current.
r DS ( ON )
(EQ. 3)
R ISEN
Output Voltage Setting
The ISL6310 uses a digital to analog converter (DAC) to
generate a reference voltage based on the logic signals at the
REF0 and REF1 pins. The DAC decodes the 2-bit logic signals
into one of the discrete voltages shown in Table 1. Each REF0
and REF1 pins are pulled up to an internal 1.2V voltage by
weak current sources (40μA current, decreasing to 0 as the
voltage at the REF0, REF1 pins varies from 0 to the internal
1.2V pull-up voltage). External pull-up resistors or active-high
output stages can augment the pull-up current sources, up to a
voltage of 5V. The DAC pin must be connected to REF pin
through a 1k Ω to 5k Ω resistor and a filter capacitor (0.022μF) is
connected between REF and GND.
OLD SAMPLE
CURRENT
NEW SAMPLE
CURRENT
The ISL6310 accommodates the use of external voltage
TIME
FIGURE 4. SAMPLE AND HOLD TIMING
The ISL6310 supports MOSFET r DS(ON) current sensing to
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
the status of the 2PH pin, as described in the “PWM
reference connected to REF pin if a different output voltage
is required. The DAC voltage must be set at least as high as
external reference. The error amp internal noninverting input
is the lower of REF or (DAC +300mV).
A third method for setting the output voltage is to use a
resistor divider (R P1 , R S1 ) from the output terminal (V OUT )
to VSEN pin to set the output voltage level as shown in
Figure 6. This method is good for generating voltages up to
2.3V (with the REF voltage set to 1.5V).
I SEN = I x ------------------------- ) -
R
V OUT = V REF ? ---------------------------------- ? + V OFS – V DROOP
R
I n
L
r DS ( ON
ISEN
V IN
CHANNEL N
UPPER MOSFET
For this case, the output voltage can be obtained as follows:
( R S1 + R P1 ) (EQ. 4)
P1
SAMPLE
AND
HOLD
-
+
ISEN(n)
R ISEN
I L
-
I L x r DS ( ON )
It is recommended to choose resistor values of less than
500 Ω for R S1 and R P1 resistors in order to get better output
voltage DC accuracy.
TABLE 1. ISL6310 DAC VOLTAGE SELECTION TABLE
REF1 REF0 DAC
CHANNEL N
LOWER MOSFET
+
0
0
0
1
0.600V
0.900V
ISL6310 INTERNAL CIRCUIT
EXTERNAL CIRCUIT
1
0
1.200V
FIGURE 5. ISL6310 INTERNAL AND EXTERNAL CURRENT-
1
1
1.500V
SENSING CIRCUITRY FOR CURRENT BALANCE
11
FN9209.4
August 7, 2008
相关PDF资料 |
PDF描述 |
|---|---|
| ECA50DTAN | CONN EDGECARD 100PS R/A .125 SLD |
| 2510-06K | INDUCTOR RF .18UH UNSHIELDED SMD |
| ISL6530CRZ-T | IC CONTROLLER INTEL 32QFN |
| ECA50DTAH | CONN EDGECARD 100PS R/A .125 SLD |
| 2510-04K | INDUCTOR RF .15UH UNSHIELDED SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6310EVAL1Z | 功能描述:EVALUATION BOARD FOR ISL6310 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6310IRZ | 功能描述:电压模式 PWM 控制器 W/ANNEAL 2-PH PWM CNTROL W/2-DRVRS RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6310IRZ-T | 功能描述:电压模式 PWM 控制器 W/ANNEAL 2-PH PWM CNTROL W/2-DRVRS RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6312ACRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6312ACRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。