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參數(shù)資料
| 型號： | ISL6223EVAL2 |
| 廠商： | Intersil Corporation |
| 英文描述： | Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| 中文描述： | 移動微處理器核心電壓調(diào)節(jié)器的多相降壓PWM控制器 |
| 文件頁數(shù)： | 7/15頁 |
| 文件大?。?/td> | 402K |
| 代理商： | ISL6223EVAL2 |
7
Comparator to compensate for the detected “above average”
current in that channel.
Droop Compensation
In addition to control of each power channel’s output current,
the average channel current is also used to provide CORE
voltage “droop” compensation. Average full channel current
is defined as 50
μ
A. By selecting an input resistor, R
IN
, the
amount of voltage droop required at full load current can be
programmed. The average current driven into the FB pin
results in a voltage increase across resistor R
IN
that is in the
direction to make the Error Amplifier “see” a higher voltage at
the inverting input, resulting in the Error Amplifier adjusting
the output voltage lower. The voltage developed across R
IN
is equal to the “droop” voltage. See the “Current Sensing and
Balancing” section for more details.
Applications and Convertor Start-Up
Each PWM power channel’s current is regulated. This
enables the PWM channels to accurately share the load
current for enhanced reliability. The HIP6601, HIP6602 or
HIP6603 MOSFET driver interfaces with the ISL6223. For
more information, see the HIP6601, HIP6602 or HIP6603
data sheets.
The ISL6223 controls the two PWM power channels 180
o
out of phase. Figure 2 shows the out of phase relationship
between the two PWM channels.
Power supply ripple frequency is determined by the channel
frequency, F
SW
, multiplied by the number of active channels.
For example, if the channel frequency is set to 250kHz, the
ripple frequency is 500kHz with two channels.
The IC monitors and precisely regulates the CORE voltage
of a microprocessor. After initial start-up, the controller also
provides protection for the load and the power supply. The
following section discusses these features.
Initialization
The ISL6223 operates from a 5V power supply. Many
functions are initiated by the rising supply voltage to the V
CC
pin of the ISL6223. Oscillator, Sawtooth Generator, Soft-
Start and other functions are initialized during this interval.
These circuits are controlled by POR, Power-On Reset.
During this interval, the PWM outputs are driven to a three
state condition that makes these outputs essentially open.
This state results in no gate drive to the output MOSFETs.
Once the V
CC
voltage reaches 4.375V (+125mV), a voltage
level to insure proper internal function, the PWM outputs are
enabled and the Soft-Start sequence is initiated. If for any
reason, the V
CC
voltage drops below 3.875V (+125mV). The
POR circuit shuts the converter down and again three states
the PWM outputs.
Soft-Start
After the POR function is completed with V
CC
reaching
4.375V, the Soft-Start sequence is initiated. Soft-Start, by its
slow rise in CORE voltage from zero, avoids an overcurrent
condition by slowly charging the discharged output
capacitors. This voltage rise is initiated by an internal DAC
that slowly raises the reference voltage to the error amplifier
input. The voltage rise is controlled by the oscillator
frequency and the DAC within the ISL6223, therefore, the
output voltage is effectively regulated as it rises to the final
programmed CORE voltage value.
For the first 64 PWM switching cycles, the DAC output
remains inhibited and the PWM outputs remain three stated.
From the 65th cycle and for another, approximately 300
cycles the PWM output remains low, clamping the lower
output MOSFETs to ground, see Figure 3. The time
variability is due to the Error Amplifier, Sawtooth Generator
and Comparators moving into their active regions. After this
short interval, the PWM outputs are enabled and increment
the PWM pulse width from zero duty cycle to operational
pulse width, thus allowing the output voltage to slowly reach
the CORE voltage. The CORE voltage will reach its
programmed value before the 4096 cycles, but the PGOOD
output will not be initiated until the 4096th switching cycle.
The Soft-Start time or delay time, DT = 4096/F
SW
. For an
oscillator frequency, F
SW
, of 200kHz, the first 64 cycles or
320
μ
s, the PWM outputs are held in a three state level as
explained above. After this period and a short interval
described above, the PWM outputs are initiated and the
voltage rises in 20.16ms, for a total delay time DT of
20.48ms.
Figure 3 shows the start-up sequence as initiated by an
enable (EN) switch
,
applied to the ISL6223. The start-up is
enabled at the falling edge of the EN switch output.
Figure 4 shows the waveforms when the regulator is
operating at 200kHz. Note that the Soft-Start duration is a
function of the Channel Frequency as explained previously.
Also note the pulses on the COMP terminal. These pulses
are the current correction signal feeding into the comparator
input (see the
Block Diagram
on page 2).
Figure 5 shows the regulator operating from a 12V battery
supply. In this system, the battery voltage is available before
any other voltages, including the 5V bias voltage V
CC
for the
controller IC. In this figure, note the slight rise in PGOOD as
PWM 1
PWM 2
FIGURE 2. TWO PHASE PWM OUTPUT AT 500kHz
ISL6223
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6224CA-T | Single Output Mobile-Friendly PWM Controller |
| ISL6224CAZA-T | ER 5C 2#16 3#12 PIN PLUG |
| ISL6224CAZ-T | KJ 66C 66#22D SKT RECP |
| ISL6224CAZ | Single Output Mobile-Friendly PWM Controller |
| ISL6224 | Single Output Mobile-Friendly PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6224 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224CA | 功能描述:電流型 PWM 控制器 Mobile-Friendly RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| ISL6224CA-T | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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) |
| ISL6224CAZ | 功能描述:電流型 PWM 控制器 MOBILE PWM CNTRLR 16-PIN SSOP RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
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