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參數(shù)資料
| 型號： | ISL6539CA |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Wide Input Range Dual PWM Controller with DDR Option |
| 中文描述： | DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | PLASTIC, QSOP-28 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 503K |
| 代理商： | ISL6539CA |
9
FN9144.4
June 6, 2005
Theory of Operation
Operation
The ISL6539 is a dual channel PWM controller intended for
use in power supplies for graphic chipsets, SDRAM, DDR
DRAM, or other power applications. The IC integrates two
control circuits for two synchronous buck converters. The
output voltage of each controller can be set in the range of
0.9V to 5.5V by an external resistive divider.
The synchronous buck converters can operate from either
an unregulated DC source with a voltage ranging from 5.0V
to 15V, or from a regulated system rail of 3.3V or 5V. In either
operational mode the controller is biased from the +5V
source.
The controllers operate in the current mode with input
voltage feed-forward which simplifies feedback loop
compensation and rejects input voltage variation. An
integrated feedback loop compensation dramatically
reduces the number of external components.
The ISL6539 has a special means to rearrange its internal
architecture into a complete DDR solution. When the DDR
pin is set high, the second channel can provide the capability
to track the output voltage of the first channel. The buffered
reference voltage required by DDR memory chips is also
provided.
Initialization
The ISL6539 initializes if at least one of the enable pins is
set high. The Power-On Reset (POR) function continually
monitors the bias supply voltage on the VCC pin, and
initiates soft-start operation when EN1 or EN2 is high after
the input supply voltage exceeds 4.45V. Should this voltage
drop lower than 4.14V, the POR disables the chip.
Soft-Start
When soft-start is initiated, the voltage on the SOFT pin of
the enabled channel starts to ramp up gradually with the
internal 5
μ
A current charging the soft-start capacitor. The
output voltage follows the soft-start voltage.
When the SOFT pin voltage reaches 0.9V, the output voltage
comes into regulation. When the SOFT voltage reaches
1.5V, the power good (PGOOD) is enabled. The soft-start
process is depicted in Figure 3.
Even though the soft-start pin voltage continues to rise after
reaching 1.5V, this voltage does not affect the output
voltage.
The soft-start time (the time from the moment when EN
becomes high to the moment when PGOOD is reported) is
determined by the following equation:
The time it takes the output voltage to come into regulation
can be obtained from the following equation.
×
=
During soft-start, before the PGOOD pin is enabled, the
undervoltage protection is prohibited. The overvoltage and
overcurrent protection functions are enabled.
If the output capacitor has residue voltage before start-up,
both lower and upper MOSFETs are in off-state until the soft-
start capacitor charges equal the VSEN pin voltage. This will
ensure the output voltage starts from its existing voltage
level.
Output Voltage Program
The output voltage of either channel is set by a resistive
divider from the output to ground. The center point of the
divider is connected to the VSEN pin as shown in Figure 4.
The output voltage value is determined by the following
equation.
where 0.9V is the value of the internal reference. The VSEN
pin voltage is also used by the controller for the power good
function and to detect undervoltage and overvoltage
conditions.
Ch3 1.0V
Ch2 2.0V
Ch4 5.0V
M1.00ms
Ch1 5.0V
3
2
4
1
EN
0.9V1.5V
SOF
T
VOUT
PGOOD
FIGURE 3. START UP
T
SOFT
----------------------------------
=
T
RISE
0.6
T
SOFT
V
O
-----------------------------+
)
=
ISL6539
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PDF描述 |
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| ISL6539CA-T | Wide Input Range Dual PWM Controller with DDR Option |
| ISL6539CAZ | Wide Input Range Dual PWM Controller with DDR Option |
| ISL6539CAZ-T | Wide Input Range Dual PWM Controller with DDR Option |
| ISL6539IA | Wide Input Range Dual PWM Controller with DDR Option |
| ISL6539IA-T | Circular Connector; No. of Contacts:29; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:25-29 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6539CA-T | 功能描述:IC CTRLR DDR DRAM, SDRAM 28QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| ISL6539CAZ | 功能描述:電流型 PWM 控制器 VER OF ISL6539CA 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 |
| ISL6539CAZ-T | 功能描述:電流型 PWM 控制器 VER OF ISL6539CA-T 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 |
| ISL6539EVAL1 | 功能描述:EVAL BOARD 1 FOR ISL6539 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 線性穩(wěn)壓器 (LDO) 系列:* 產(chǎn)品變化通告:1Q2012 Discontinuation 30/Mar/2012 設(shè)計(jì)資源:NCP590MNDPTAGEVB Gerber Files 標(biāo)準(zhǔn)包裝:1 系列:- 每 IC 通道數(shù):2 - 雙 輸出電壓:1.8V，2.8V 電流 - 輸出:300mA 輸入電壓:2.1 ~ 5.5 V 穩(wěn)壓器類型:正，固定式 工作溫度:-40°C ~ 85°C 板類型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名稱:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6539EVAL2 | 功能描述:EVAL BOARD 2 FOR ISL6539 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 線性穩(wěn)壓器 (LDO) 系列:* 產(chǎn)品變化通告:1Q2012 Discontinuation 30/Mar/2012 設(shè)計(jì)資源:NCP590MNDPTAGEVB Gerber Files 標(biāo)準(zhǔn)包裝:1 系列:- 每 IC 通道數(shù):2 - 雙 輸出電壓:1.8V，2.8V 電流 - 輸出:300mA 輸入電壓:2.1 ~ 5.5 V 穩(wěn)壓器類型:正，固定式 工作溫度:-40°C ~ 85°C 板類型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名稱:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
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