- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383154 > ISL6529CB (INTERSIL CORP) Logarithmic Amplifier 16-CDIP -55 to 125 PDF資料下載
參數(shù)資料
| 型號： | ISL6529CB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Logarithmic Amplifier 16-CDIP -55 to 125 |
| 中文描述： | SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | PLASTIC, MS-012-AB, SOIC-14 |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 623K |
| 代理商： | ISL6529CB |
7
FN9070.5
April 12, 2005
FB2 (Pin 6), (Pin 5 QFN)
Connect the output of the linear regulator to this pin
through a properly sized resistor divider. The voltage at this
pin is regulated to 0.8V. This pin is also monitored for
undervoltage events.
Pulling and holding FB2 above 1.28V shuts down both
regulators. Releasing FB2 initiates soft-start on both regulators.
NC (Pins 7, 8, 11, and 12), (Pins 6, 7, 8, 11, 13 and
15 QFN)
No internal connection.
FB (Pin 9), (Pin 9 QFN) and COMP (Pin 10), (Pin 10
QFN)
FB and COMP are the available external pins of the error
amplifier. The FB pin is the inverting input of the error amplifier
and the COMP pin is the error amplifier output. These pins are
used to compensate the voltage-mode control feedback loop of
the standard synchronous rectified buck converter.
12VCC(Pin 13), (Pin 12 QFN)
Provides bias voltage for the gate drivers.The voltage at this
pin is monitored for Power-On Reset (POR) purposes.
UGATE (Pin 14), (Pin 14 QFN)
Connect UGATE to the upper MOSFET gate. This pin
provides the gate drive for the MOSFET.
Description
Operation Overview
The ISL6529 monitors and precisely controls two output
voltage levels. Refer to the
Block Diagram, Simplified Power
System Diagram
, and
Typical Application Schematic
on pp.
2–3. The controller is intended for use in graphics cards or
embedded processor applications with 5V and 12V bias input
available. The IC integrates both a standard buck PWM
controller and a linear controller. The PWM controller is
designed to regulate the high current GPU voltage (V
OUT1
).
The PWM controller regulates the output voltage to a level
programmed by a resistor divider. The linear controller is
designed to regulate the lower current local memory voltage
(V
OUT2
) through an external N-Channel MOS pass transistor.
Initialization
The ISL6529 automatically initializes upon application of
input power. Special sequencing of the input supplies is not
necessary. The POR function continually monitors the input
bias supply voltage at the 5VCC and 12VCC pins. The POR
function initiates soft-start operation after these supply
voltages exceed their POR threshold voltages.
Soft-Start
The POR function initiates the digital soft-start sequence.
Both the linear regulator error amplifier and PWM error
amplifier reference inputs are forced to track a voltage level
proportional to the soft-start voltage. As the soft-start voltage
slews up, the PWM comparator regulates the output relative
to the tracked soft-start voltage, slowly charging the output
capacitor(s). Simultaneously, the linear output follows the
smooth ramp of the soft-start function into normal regulation.
Figure 1 shows the soft-start sequence of an ISL6529
evaluation board powered by an ATX supply. Note the
uniform linear output voltage rise of the two ISL6529 output
voltages. Once the voltage on 5VCC crosses the POR
thresholds, both outputs begin their soft-start sequence. The
triangle waveform from the PWM oscillator is compared to
the rising error amplifier output voltage. As the error amplifier
voltage increases, the pulse-width on the PWM increases to
reach its steady-state duty cycle. The error amplifier
reference of the linear controller also rises relative to the
soft-start reference.
Figure 2 shows the controlled stepped output voltage rise
and associated charging current of a 390
μ
F polymer
capacitor. By providing many small steps of current that
effectively charge the output capacitor, the potentially large
peak current resulting from a sudden, uncontrolled voltage
rise is eliminated.
The clock for the DAC producing the 30mV steps is
approximately 18.5kHz, so there is a 18.5kHz ripple current
component that lasts for the approximate 2.8ms start-up
interval. A few clock cycles are used for initialization to
insure that soft-start begins near zero volts.
FIGURE 1. ATX SUPPLY POWERING AN ISL6529
EVALUATION BOARD
5VCC INPUT
3.3V INPUT
1.5V OUTPUT
2.4V OUTPUT
ISL6529, ISL6529A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6529CBZ | Logarithmic Amplifier 16-CDIP -55 to 125 |
| ISL6529CBZ-T | Dual Low-Noise High-Drive Operational Amplifier 8-SOIC 0 to 70 |
| ISL6529CR | Dual Low-Noise High-Drive Operational Amplifier 8-SOIC 0 to 70 |
| ISL6529ACB-T | JT 3C 3#16 SKT PLUG |
| ISL6530CB-T | Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory VDDQ and VTT Termination |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6529CB-T | 功能描述:IC REG DL BCK/LINEAR 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| ISL6529CBZ | 功能描述:電壓模式 PWM 控制器 DLG-SYNCH BUCK & LINEAR PWR CONTROLLE RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| ISL6529CBZ-T | 功能描述:電壓模式 PWM 控制器 DLG-SYNCH BUCK & LINEAR PWR CONTROLLE RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| ISL6529CR | 功能描述:IC REG DL BCK/LINEAR SYNC 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| ISL6529CR-T | 功能描述:IC REG DL BCK/LINEAR SYNC 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。