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參數(shù)資料
| 型號(hào)： | ISL8009 |
| 廠商： | Intersil Corporation |
| 英文描述： | 1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator(1.5A低靜態(tài)電流，1.6MHz高效同步降壓調(diào)節(jié)器) |
| 中文描述： | 1.5A的低靜態(tài)電流1.6MHz的高效率同步降壓穩(wěn)壓器（1.5A的低靜態(tài)電流，1.6MHz的高效同步降壓調(diào)節(jié)器） |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大?。?/td> | 763K |
| 代理商： | ISL8009 |
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10
FN6441.0
July 11, 2007
block only affects the operation during the start-up and will
be discussed separately. The error amplifier is a
transconductance amplifier that converts the voltage error
signal to a current output. The voltage loop is internally
compensated with the 30pF and 300k
Ω
RC network. The
maximum EAMP voltage output is precisely clamped to the
bandgap voltage (1.172V).
SKIP Mode
The ISL8009 enters a pulse-skipping mode at light load to
minimize the switching loss by reducing the switching
frequency. Figure 32 illustrates the skip-mode operation. A
zero-cross sensing circuit shown in Figure 30 monitors the
N-MOSFET current for zero crossing. When 8 consecutive
cycles of the N-MOSFET crossing zero are detected, the
regulator enters the skip mode. During the 8 detecting
cycles, the current in the inductor is allowed to become
negative. The counter is reset to zero when the current in
any cycle does not cross zero.
Once the skip mode is entered, the pulse modulation starts
being controlled by the SKIP comparator shown in Figure 30.
Each pulse cycle is still synchronized by the PWM clock. The
P-MOSFET is turned on at the clock and turned off when its
current reaches 20% of the current limit value (0.2V at the
CSA output). As the average inductor current in each cycle
is higher than the average current of the load, the output
voltage rises cycle over cycle. When the output voltage
reaches 1.5% above the nominal voltage, the P-MOSFET is
turned off immediately and the inductor current is fully
discharged to zero and stays at zero. The output voltage
reduces gradually due to the load current discharging the
output capacitor. When the output voltage drops to the
nominal voltage, the P-MOSFET will be turned on again at
the clock, repeating the previous operations.
The regulator resumes normal PWM mode operation when
the output voltage drops 1.5% below the nominal voltage.
Mode Control
The ISL8009 has a SKIP pin that controls the operation
mode. When the SKIP pin is driven to low or shorted to
ground, the regulator operates in a forced PWM mode. The
forced PWM mode remains the fixed PWM frequency at light
load instead of entering the skip mode.
Overcurrent Protection
The overcurrent protection is realized by monitoring the CSA
output with the OCP comparator, as shown in Figure 30. The
current sensing circuit has a gain of 0.4V/A, from the
N-MOSFET current to the CSA output. When the CSA
output reaches 0.8V, (which is equivalent to 2A for the switch
current) the OCP comparator is tripped to turn off the
P-MOSFET immediately.
Short-Circuit Protection
A short-circuit protection SCP comparator monitors the VFB
pin voltage for output short-circuit protection. When the VFB
is lower than 0.2V, the SCP comparator forces the PWM
oscillator frequency to drop to 1/3 of the normal operation
value. This comparator is effective during start-up or an
output short-circuit event.
RSI/POR Function
When powering up, the open-collector Power-On-Reset
output holds low for about 200ms after VO reaches the
preset voltage. When the active-HI reset signal RSI is
issued, POR goes to low immediately and holds for the
FIGURE 31. PWM OPERATION WAVEFORMS
V
EAMP
V
CSA1
Duty
CYCLE
I
L
V
OUT
FIGURE 32. SKIP MODE OPERATION WAVEFORMS
CLOCK
I
L
V
OUT
Nominal + 1.5%
NOMINAL +1.5%
CURRENT LIMIT
LOAD CURRENT
0
8 CYCLES
NOMINAL
ISL8009
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL8009A | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator |
| ISL8009AEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL8009A RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類(lèi)型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類(lèi)型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL8009AIRZ-T | 功能描述:IC REG BUCK SYNC ADJ 1.5A 8DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:EZBuck™ 類(lèi)型:降壓（降壓） 輸出類(lèi)型:可調(diào)式 輸出數(shù):1 輸出電壓:0.8 V ~ 22.1 V 輸入電壓:3 V ~ 26 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):1.5MHz 電流 - 輸出:1.8A 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤(pán) 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:8-DFN（2x2） 其它名稱(chēng):785-1276-1 |
| ISL8009AIRZ-T7A | 功能描述:IC REG BUCK SYNC ADJ 1.5A 8DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| ISL8009AIRZ-TK | 功能描述:IC REG BUCK SYNC ADJ 1.5A 8DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
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