参数资料
| 型号： | ISL6334DCRZ |
| 厂商： | Intersil |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE VR11.1 40QFN |
| 标准包装： | 50 |
| 应用： | 控制器，Intel VR11.1 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
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页第14页第15页第16页第17页当前第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
ISL6334D
t D2 = ------------------------ ( μ s )
ISL6334D INTERNAL CIRCUIT
EXTERNAL CIRCUIT
1.1xR SS
6.25x25
(EQ. 12)
( V VID – 1.1 ) xR SS
VCC
+ 12 V
6.25x25
t D4 = ------------------------------------------------ ( μ s )
(EQ. 13)
POR
CIRCUIT
ENABLE
COMPARATOR
+
-
0.875V
100k Ω
EN_PWR
9.1k Ω
For example, when VID is set to 1.5V and the R SS is set at
100k Ω , the first soft-start ramp time t D2 will be 704μs and the
second soft-start ramp time t D4 will be 256μs.
After the DAC voltage reaches the final VID setting,
VR_RDY will be set to high with the fixed delay t D5 . The
typical value for t D5 is 85μs. Before the VR_RDY is
released, the controller disregards the PSI# input and
+
EN_VTT
always operates in normal CCM PWM mode.
-
V OUT, 500mV/DI V
0.875V
SOFT-START
AND
FAULT LOGIC
t D1
t D2
t D3 t D4
t D5
EN_VTT
FIGURE 8. POWER SEQUENCING USING THRESHOLD
SENSITIVE ENABLE (EN) FUNCTION
Soft-Start
ISL6334D based VR has 4 periods during soft-start, as shown
in Figure 9. After VCC, EN_VTT and EN_PWR reach their
POR/enable thresholds, the controller will have a fixed delay
period t D1 . After this delay period, the VR will begin first
soft-start ramp until the output voltage reaches 1.1V VBOOT
voltage. Then, the controller will regulate the VR voltage at 1.1V
for another fixed period t D3 . At the end of t D3 period, ISL6334D
reads the VID signals. If the VID code is valid, ISL6334D will
initiate the second soft-start ramp until the voltage reaches the
VR_RDY
500μs/DIV
FIGURE 9. SOFT-START WAVEFORMS
Current Sense Output
The current flowing out of the IMON pin is equal to the
sensed average current inside ISL6334D. In typical
applications, a resistor is placed from the IMON pin to GND
to generate a voltage, which is proportional to the load
current and the resistor value, as shown in Equation 14:
V IMON = ------------------- ------------------ I LOAD
R ISEN
VID voltage minus offset voltage.
The soft-start time is the sum of the 4 periods, as shown in
Equation 11.
N
R IOUT R X
(EQ. 14)
t SS = t D1 + t D2 + t D3 + t D4
(EQ. 11)
where V IMON is the voltage at the IMON pin, R IOUT is the
resistor between the IMON pin and GND, I LOAD is the total
t D1 is a fixed delay with the typical value as 1.36ms. t D3 is
determined by the fixed 85μs plus the time to obtain valid
VID voltage. If the VID is valid before the output reaches the
1.1V, the minimum time to validate the VID input is 500ns.
Therefore, the minimum t D3 is about 86μs.
During t D2 and t D4 , ISL6334D digitally controls the DAC
voltage change at 6.25mV per step. The time for each step is
determined by the frequency of the soft-start oscillator, which
is defined by the resistor R SS from SS pin to GND. The
second soft-start ramp time t D2 and t D4 can be calculated
based on Equations 12 and 13:
18
output current of the converter, R ISEN is the sense resistor
connected to the ISEN+ pin, N is the active channel number,
and R X is the DC resistance of the current sense element,
either the DCR of the inductor or R SENSE depending on the
sensing method.
The resistor from the IMON pin to GND should be chosen to
ensure that the voltage at the IMON pin is less than 1.11V
under the maximum load current. If the IMON pin voltage is
higher than 1.11V, overcurrent shutdown will be triggered, as
A small capacitor can be placed between the IMON pin and
GND to reduce the noise impact. If this pin is not used, tie it
to GND.
FN6802.3
November 22, 2013
相关PDF资料 |
PDF描述 |
|---|---|
| GSC35DRTN-S93 | CONN EDGECARD 70POS DIP .100 SLD |
| ISL6536IB | IC SUPERVISOR 4-CHAN 8-SOIC |
| ISL6334DCRZ-T | IC CTRLR PWM 4PHASE VR11.1 40QFN |
| MIC5330-PGYML TR | IC REG LDO 3V/1.8V .3A 8-MLF |
| ISL6334AIRZ-T | IC CTRLR PWM 4PHASE BUCK 40-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6334DCRZ-T | 功能描述:IC CTRLR PWM 4PHASE VR11.1 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 |
| ISL6334DIRZ | 功能描述:IC CTRLR PWM 4PHASE VR11.1 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 |
| ISL6334DIRZ-T | 功能描述:IC CTRLR PWM 4PHASE VR11.1 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 |
| ISL6334IRZ | 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 |
| ISL6334IRZ-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 |
发布紧急采购，3分钟左右您将得到回复。