参数资料
| 型号： | ISL6568CR |
| 厂商： | Intersil |
| 文件页数： | 18/30页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 2PHASE 32-QFN |
| 标准包装： | 60 |
| 应用： | 控制器，Intel VRM9，VRM10，AMD Hammer 应用 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.84 V ~ 1.6 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： | 管件 |
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ISL6568
Thus, the soft-start period (not including the 16 PHASE clock
ISL6568 INTERNAL CIRCUIT
EXTERNAL CIRCUIT
cycle delay) up to a given voltage, V DAC , can be approximated
by Equation 13.
T SS = ---------------------------------
VCC
PVCC1
V DAC ? 1280
f S
(EQ. 13)
POR
+ 12 V
where V DAC is the DAC-set VID voltage, and f S is the switching
frequency.
CIRCUIT
ENABLE
COMPARATOR
+
-
10.7k Ω
ENLL
1.40k Ω
The ISL6568 also has the ability to start up into a pre-charged
output, 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
SOFT-START
AND
FAULT LOGIC
0.66V
enabled, allowing the output to ramp from the pre-charged
level to the final level dictated by the DAC setting. Should the
output be pre-charged to a level exceeding the DAC setting, the
output drives are enabled at the end of the soft-start period,
leading to an abrupt correction in the output voltage down to
the DAC-set level.
FIGURE 11. POWER SEQUENCING USING THRESHOLD-SENSITIVE
ENABLE (ENLL) FUNCTION
OUTPUT PRECHARGED
ABOVE DAC LEVEL
2. The voltage on ENLL must be above 0.66V. The EN input
allows for power sequencing between the controller bias
voltage and another voltage rail. The enable comparator
holds the ISL6568 in shutdown until the voltage at ENLL
rises above 0.66V. The enable comparator has 60mV of
hysteresis to prevent bounce.
OUTPUT PRECHARGED
BELOW DAC LEVEL
3. The driver bias voltage applied at the PVCC pin must reach
the internal power-on reset (POR) rising threshold.
Hysteresis between the rising and falling thresholds assure
that once enabled, the ISL6568 will not inadvertently turn
off unless the PVCC bias voltage drops substantially (see
“Electrical Specifications” on page 6).
4. The VID code must not be 111111 or 111110 in VRM10
GND>
GND>
T1 T2
T3
V OUT (0.5V/DIV)
ENLL (5V/DIV)
mode or 11111 in AMD Hammer or VRM9 modes. These
codes signal the controller that no load is present. The
controller will enter shut-down mode after receiving either
of these codes and will execute soft-start upon receiving
any other code. These codes can be used to enable or
disable the controller but it is not recommended. After
receiving one of these codes, the controller executes a
2-cycle delay before changing the overvoltage trip level to
the shut-down level and disabling PWM. Overvoltage
shutdown cannot be reset using one of these codes.
When each of these conditions is true, the controller
immediately begins the soft-start sequence.
SOFT-START
The soft-start function allows the converter to bring up the
output voltage in a controlled fashion, resulting in a linear
ramp-up. Following a delay of 16 PHASE clock cycles between
enabling the chip and the start of the ramp, the output voltage
progresses at a fixed rate of 12.5mV per each 16 PHASE clock
cycles.
18
FIGURE 12. SOFT-START WAVEFORMS FOR ISL6568-BASED
MULTI-PHASE CONVERTER
Fault Monitoring and Protection
The ISL6568 actively monitors output voltage and current to
detect fault conditions. Fault monitors trigger protective
measures to prevent damage to a microprocessor load. 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 power good
signal.
FN9187.5
January 12, 2012
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| ISL6568CRZA | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 0.8375V TO 12V 60A 32QFN EP - Rail/Tube 制造商:Intersil 功能描述:W/ANNEAL 2-PH PWM CNTRLR 2-DRVRS VRM9 |
| ISL6568CRZA-T | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 0.8375V TO 12V 60A 32QFN EP - Tape and Reel 制造商:Intersil 功能描述:W/ANNEAL 2-PHS PWM CNTRLR W/2-DRVRS |
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