参数资料
| 型号： | ISL6308CRZ |
| 厂商： | Intersil |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 3PHASE BUCK 40-QFN |
| 标准包装： | 500 |
| 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： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
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ISL6308
followed by a linear ramp with a rate determined by the
switching period, 1/F sw .
* CONNECT DROOP TO IREF
TO DISABLE THE DROOP FEATURE.
t SS = --------------------------------------------
64 + DAC ? 1280
F SW
(EQ. 12)
R OCSET
For example, a regulator with 450kHz switching frequency
IREF
DROOP*
ICOMP
- V OCSET +
OCSET
having REF voltage set to 1.2V has t SS equal to 3.55ms.
A 100mV offset exists on the remote-sense amplifier at the
beginning of soft-start and ramps to zero during the first 640
ISUM
+
ISEN
-
-
V DROOP
+
100μA
cycles of soft-start (704 cycles following enable). This
prevents the large inrush current that would otherwise occur
should the output voltage start out with a slight negative
bias.
VDIFF
+1V
+
-
OC
The ISL6308 also has the ability to start-up into a pre-charged
output as shown in Figure 12, without causing any
unnecessary disturbance. The FB pin is monitored during
soft-start, and should it be higher than the equivalent internal
ramping reference voltage, the output drives hold both
MOSFETs off. Once the internal ramping reference exceeds
the FB pin potential, the output drives are enabled, allowing
the output to ramp from the pre-charged level to the final level
DAC + 150mV
V OVP
SOFT-START, FAULT
AND CONTROL LOGIC
dictated by the reference setting. Should the output be
pre-charged to a level exceeding the reference setting, the
output drives are enabled at the end of the soft-start period,
VSEN
+
x1
-
+
OV
PGOOD
leading to an abrupt correction in the output voltage down to
the “reference set” level.
RGND
-
-
+
UV
OUTPUT PRECHARGED
ABOVE DAC LEVEL
0.82 x DAC ISL6308 INTERNAL CIRCUITRY
FIGURE 13. POWER-GOOD AND PROTECTION CIRCUITRY
OUTPUT PRECHARGED
BELOW DAC LEVEL
One common power-good indicator is provided for linking to
external system monitors. The schematic in Figure 13
outlines the interaction between the fault monitors and the
GND>
GND>
T1 T2
T3
V OUT (0.5V/DIV)
ENLL (5V/DIV)
power-good signal
Power-Good Signal
The power-good pin (PGOOD) is an open-drain logic output
that transitions high when the converter is operating after
soft-start. PGOOD pulls low during shutdown and releases
high after a successful soft-start. PGOOD transitions low
FIGURE 12. SOFT-START WAVEFORMS FOR ISL6308-BASED
MULTI-PHASE CONVERTER
Fault Monitoring and Protection
The ISL6308 actively monitors output voltage and current to
detect fault conditions. Fault monitors trigger protective
measures to prevent damage to the load.
16
when an undervoltage, overvoltage, or overcurrent condition
is detected or when the controller is disabled by a reset from
ENLL or POR. If after an undervoltage or overvoltage event
occurs the output returns to within under and overvoltage
limits, PGOOD will return high.
Undervoltage Detection
The undervoltage threshold is set at 82% of the REF voltage.
When the output voltage (VSEN-RGND) is below the
undervoltage threshold, PGOOD gets pulled low. No other
action is taken by the controller. PGOOD will return high if the
output voltage rises above 85% of the REF voltage.
FN9208.4
September 30, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6308CRZR5374 | 制造商:Intersil Corporation 功能描述:ISL6308CRZ W/ 24HR BURN-IN - Rail/Tube 制造商:Intersil Corporation 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN 制造商:Intersil 功能描述:ISL6308CRZ W/24HRU RN-IN |
| ISL6308CRZ-T | 功能描述:电压模式 PWM 控制器 DAC-LESS MULTI-PHS PWM CNTRLR W/3-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 |
| ISL6308CRZ-TR5374 | 制造商:Intersil Corporation 功能描述:ISL6308CRZ W/ 24HR BURN-IN - Tape and Reel 制造商:Intersil Corporation 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN 制造商:Intersil 功能描述:ISL6308CRZ W/24HRU RN-IN |
| ISL6308CRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6308CRZ-T W/GOLD BOND WIRE ONLY - Tape and Reel |
| ISL6308EVAL1Z | 制造商:Intersil Corporation 功能描述:ISL6308 EVALUATION BOARD 1 - ROHS COMPLIANT - QFN - Bulk |
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