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參數(shù)資料
| 型號(hào)： | ISL6564IR |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Multi-Phase PWM Controller with Linear 6-bit DAC Capable of Precision rDS(ON) or DCR Differential Current Sensing |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, PLASTIC, MO-220-VJJD, QFN-40 |
| 文件頁數(shù)： | 17/27頁 |
| 文件大?。?/td> | 798K |
| 代理商： | ISL6564IR |
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17
FN9156.2
December 27, 2004
Dynamic VID
Modern microprocessors need to make changes to their
core voltage as part of normal operation. They direct the
core-voltage regulator to do this by making changes to the
VID inputs during regulator operation. The power
management solution is required to monitor the DAC inputs
and respond to on-the-fly VID changes in a controlled
manner. Supervising the safe output voltage transition within
the DAC range of the processor without discontinuity or
disruption is a necessary function of the core-voltage
regulator.
The ISL6564 checks the VID inputs at the three edges of
16MHz clock. If the VID code is found to have changed, the
controller waits half of a complete cycle before executing a
12.5mV change. If during the half-cycle wait period, the
difference between DAC level and the new VID code
changes sign, no change is made. If the VID code is more
than 1 bit higher or lower than the DAC (not recommended),
the controller will execute step-up and step down VID
change at a speed of 12.5mV every 4
μ
s until VID and DAC
are equal.
In order to ensure the smooth transition of output voltage
during VID change, a VID step change smoothing network
composed of R
REF
and C
REF
is required for an ISL6564
based voltage regulator. The selection of R
REF
is based on
the desired offset as detailed above in
Output-Voltage Offset
Programming
. The selection of C
REF
is based on the time
duration for 1 bit VID change and the allowable delay time.
Assuming the microprocessor controls the VID change at 1
bit every T
VID
, the relationship between the time constant of
R
REF
and C
REF
network and T
VID
is given by Equation 12.
Where, T
VID
= 4
μ
s, k is the number of the internal VID
change cycle. If Typically R
REF
is selected to be 1k
, the
allowable delay time for VR to respond to new VID code is 5
VID change cycles (totally 20
μ
s), the value of C
REF
should
be 22nF based on Equation 12.
Operation Initialization
Prior to converter initialization, proper conditions must exist
on the enable inputs and VCC. When the conditions are met,
the controller begins soft-start. Once the output voltage is
within the proper window of operation, PGOOD asserts
logic 1.
Enable and Disable
While in shutdown mode, the PWM outputs are held in a
high-impedance state to assure the drivers remain off. The
following input conditions must be met before the ISL6564 is
released from shutdown mode.
1. The bias voltage applied at VCC must reach the internal
power-on reset (POR) rising threshold. Once this
threshold is reached, proper operation of all aspects of
the ISL6564 is guaranteed. Hysteresis between the rising
and falling thresholds assure that once enabled, the
ISL6564 will not inadvertently turn off unless the bias
voltage drops substantially (see
Electrical
Specifications
).
DYNAMIC
VID D/A
E/A
VCC
OR
GND
DAC
FB
REF
OFS
VCC
GND
+
-
+
-
0.5V
2.0V
R
OFS
R
REF
ISL6564CR
FIGURE 9. OUTPUT VOLTAGE OFFSET PROGRAMMING
WITH ISL6564CR
C
REF
R
REF
k T
VID
=
(EQ. 12)
FIGURE 10. POWER SEQUENCING USING THRESHOLD-
SENSITIVE ENABLE (EN) FUNCTION
-
+
1.23V
EXTERNAL CIRCUIT
ISL6564 INTERNAL CIRCUIT
EN
+12V
POR
CIRCUIT
10.7k
1.40k
ENABLE
COMPARATOR
SOFT START
AND
FAULT LOGIC
ENLL
VCC
ISL6564
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ISL6564IR-T | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6564IRZ | 功能描述:電流型 PWM 控制器 MULTI-PHS PWM CNTRLR W/0 525-1 3 VID INDU RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6564IRZ-T | 功能描述:電流型 PWM 控制器 MULTI-PHS PWM CNTRLR W/0 525-1 3 VID RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6565ACB | 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
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