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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)： | 9/15頁 |
| 文件大?。?/td> | 402K |
| 代理商： | ISL6223EVAL2 |
9
Overcurrent
In the event of an overcurrent condition, the overcurrent
protection circuit reduces the average current delivered to
less than 25% of the current limit. When an overcurrent
condition is detected, the controller forces all PWM outputs
into a three state mode. This condition results in the gate
driver removing drive to the output stages. The ISL6223
goes into a wait delay timing cycle that is equal to the Soft-
Start ramp time. PGOOD also goes “l(fā)ow” during this time
due to VSEN going below its threshold voltage. To lower the
average output dissipation, the Soft-Start initial wait time is
increased from 64 to 4096 cycles, then the Soft-Start ramp is
initiated. At a PWM frequency of 200kHz, for instance, an
overcurrent detection would cause a dead time of 20.48ms,
then a ramp of 20.16ms.
At the end of the delay, PWM outputs are restarted and the
Soft-Start ramp is initiated. If a short is present at that time,
the cycle is repeated. This is the hiccup mode.
Figure 6 shows the supply shorted under operation and the
hiccup operating mode described above. Note that due to
the high short circuit current, overcurrent is detected before
completion of the start-up sequence so the delay is not quite
as long as the normal Soft-Start cycle.
DACOUT Pin
The internal DAC output is brought out to pin 11, DACOUT,
in ISL6223. The typical output impedance of the DAC is
1.7k
. The DACOUT pin allows the user to connect a
capacitor between this pin and the ground to form an RC
filter to slow down the voltage transition at the non-inverting
input of the error amplifier, when the VID code is being
changed. Slower voltage transition reduces the inrush
current to avoid tripping the overcurrent protection during the
transition. Typical systems require the transition to be
finished within 100
μ
s, therefore, a time constant of 30
μ
s to
40
μ
s is a good tradeoff between the inrush current and the
transition time. Connecting a 22nF capacitor to the DACOUT
results in a time constant of 37
μ
s for the RC filter. Figure 7
shows the waveforms for the VID changes from 1.3V to 1.6V.
From top to bottom, the waveforms are the core voltage, the
DACOUT, and the two inductor currents.
PGOOD
SHORT
CURRENT
50A/DIV.
SHORT APPLIED HERE
FIGURE 6. SHORT APPLIED TO SUPPLY AFTER POWER-UP
VCORE
DACOUT
INDUCTOR
CURRENTS
FIGURE 7. VID CHANGES FROM 1.3V TO 1.6V. THE LOAD
CURRENT IS SET TO 10A.
TABLE 1. VOLTAGE IDENTIFICATION CODES
VOLTAGE IDENTIFICATION CODE AT
PROCESSOR PINS
VID4
VID3
VID2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VCC
CORE
(V
DC
)
Shutdown
0.925
0.950
0.975
1.000
1.025
1.050
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.275
Shutdown
1.300
1.350
1.400
1.450
1.500
1.550
1.600
1.650
1.700
1.750
1.800
1.850
1.900
1.950
2.000
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
ISL6223
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| 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:- 標準包裝: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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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