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參數(shù)資料
| 型號： | ISL6569CBZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Multi-Phase PWM Controller |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | LEAD FREE, PLASTIC, MS-013-AD, SOIC-24 |
| 文件頁數(shù)： | 15/22頁 |
| 文件大?。?/td> | 497K |
| 代理商： | ISL6569CBZ |
15
FN9085.7
December 29, 2004
First, all PWM outputs are commanded low. Directing the
Intersil drivers to turn on the lower MOSFETs; shunting the
output to ground preventing any further increase in output
voltage. The PWM outputs remain low until VDIFF falls to the
programmed DAC level at which time they go into a high-
impedance state. The Intersil drivers respond by turning off
both upper and lower MOSFETs. If the over-voltage
condition reoccurs, the ISL6569 will again command the
lower MOSFETs to turn on. The ISL6569 will continue to
protect the load in this fashion as long as the over-voltage
repeats.
Second, the OVP pin pulls to VCC and can deliver 100mA
into the gate of either a MOSFET or SCR placed on the input
rail (V
IN
) or V
OUT
. Turning on the MOSFET or SCR
collapses the power rail and causes a fuse placed further up
stream to blow. The fuse must be sized such that the
MOSFET or SCR will not overheat before the fuse blows.
Once an over-voltage condition is detected, normal PWM
operation ceases and PGOOD remains low until the
ISL6569 is reset. Cycling the voltage on EN below 1.23V or
the bias to VCC below the POR-falling threshold will reset
the controller.
Over-Current Protection
The ISL6569 takes advantage of the proportionality between
the load current and the average current, I
AVG
, to detect an
over-current condition. See the
Channel-Current Balance
section for more detail on how the average current is
created. The average current is continually compared with a
constant 90
μ
A reference current. Once the average current
exceeds the reference current, the comparator triggers the
converter to shutdown. The POR circuit places all PWM
signals in a high-impedance state which commands the
drivers to turn off both upper and lower MOSFETs. PGOOD
pulls low and the system remains in this state while the
controller counts 2048 phase clock cycles. This is followed
by a soft-start attempt (see
Soft-Start
).
During the soft-start interval, the over-current protection
circuitry remains active. As the output voltage ramps up, if an
over-current condition is detected, the ISL6569 immediately
places all PWM signals in a high-impedance state. The
ISL6569 repeats the 2048-cycle wait period and follows with
another soft-start attempt, as shown in Figure 12. This
hiccup mode of operation repeats up to seven times. On the
eighth soft-start attempt, the part latches off. Once latched
off, the ISL6559 can only be reset when the voltage on EN is
brought below 1.23V or VCC is brought below the POR
falling threshold.
Upon completion of a successful soft-start attempt,
operation will continue as normal, PGOOD will return high,
and the over-current latch counter will reset.
During VID-on-the-fly transitions, the OC comparator output
is blanked. The quality and mix of output capacitors used in
different applications leads to a wide output capacitance
range. Depending upon the magnitude and direction of the
VID change, the change in voltage across the output
capacitors could result in significant current flow. Summing
this instantaneous current with the load current already
present could drive the average current above the reference
current level and cause an OC trip during the transition. By
blanking the OC comparator during the VID-on-the-fly
transition, nuisance tripping is avoided.
General Design Guide
This design guide is intended to provide a high-level
explanation of the steps necessary to create a multi-phase
power converter. It is assumed that the reader is familiar with
many of the basic skills and techniques referenced below. In
addition to this guide, Intersil provides complete reference
designs that include schematics, bills of materials, and
example board layouts for all common microprocessor
applications.
Power Stages
Principally, the designer will be concerned with whether
components can be mounted on both sides of the circuit
board; whether through-hole components are permitted; and
the total board space available for power-supply circuitry.
Generally speaking, the most economical solutions are
those where each phase handles between 15 and 20A. All
surface-mount designs will tend toward the lower end of this
current range and, if through-hole MOSFETs can be used,
higher per-phase currents are possible. In cases where
board space is the limiting constraint, current can be pushed
as high as 30A per phase, but these designs require heat
sinks and forced air to cool the MOSFETs.
0A
0V
5ms/DIV
OUTPUT VOLTAGE,
500mV/DIV
OUTPUT CURRENT, 20A/DIV
FIGURE 12. OVERCURRENT BEHAVIOR IN HICCUP MODE
ISL6569
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6569CR | Multi-Phase PWM Controller |
| ISL6571EVAL1 | Complementary MOSFET Driver and Synchronous Half-Bridge Switch |
| ISL6571CR-T | Complementary MOSFET Driver and Synchronous Half-Bridge Switch |
| ISL6571CR | Complementary MOSFET Driver and Synchronous Half-Bridge Switch |
| ISL6571CRZ | Complementary MOSFET Driver and Synchronous Half-Bridge Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6569CBZ-T | 功能描述:IC REG CTRLR DIVIDER PWM 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 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:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6569CR | 功能描述:IC REG CTRLR DIVIDER PWM 32-QFN 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| ISL6569CR-T | 功能描述:IC REG CTRLR DIVIDER PWM 32-QFN 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| ISL6569CRZ | 功能描述:IC REG CTRLR DIVIDER PWM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 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:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6569CRZ-T | 功能描述:IC REG CTRLR DIVIDER PWM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 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:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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