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參數(shù)資料
| 型號(hào)： | ISL6558IBZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012-AC, SOIC-16 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 474K |
| 代理商： | ISL6558IBZ |
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10
FN9027.12
June 21, 2005
The PWM drive signals are switched out of phase. The PWM
drive signal phase relationship is 360° divided by the number
of active channels. Figure shows the PWM drive signals for
a four channel converter running at 125kHz. Each PWM
drive signal is 90° out of phase with the other.
Frequency Setting
A resistor, R
T
, connected between the FS/EN pin and
ground sets the frequency of the internal oscillator. Tying the
FS/EN pin to ground disables the oscillator, thus shutting
down the converter. The resistor can be calculated given the
desired channel switching frequency, F
SW
.
Figure 5 provides a graph of oscillator frequency vs R
T
. The
maximum recommended channel frequency is 1.5MHz.
Reference Voltage
An internal 0.8V reference is used for both PWM duty cycle
determination as well as output voltage protection. The
reference is trimmed such that the system, including
amplifier offset voltages, is accurate to ±
1
% over
temperature range.
Fault Protection
The ISL6558 protects the load device from damaging stress
levels. The overcurrent trip point is integral in preventing
output shorts of varying degrees from causing current spikes
which would damage a load device. The output voltage
detection features insure a safe window of operation for the
load device.
Overcurrent
The R
ISEN
resistor scales the voltage sampled across the
lower MOSFET and provides current feedback proportional
to the output current of each active channel. The ISEN
currents from all the active channels are averaged together
to form a scaled version of the total output current, I
TOTAL
.
0V
PWM1, 5V/DIV
FIGURE 4. FOUR ACTIVE CHANNEL PWM DRIVE SIGNALS
1ms/DIV
0V
PWM3, 5V/DIV
PWM4, 5V/DIV
0V
0V
PWM2, 5V/DIV
R
T
10
10.9
1.1
FSW
log
–
=
(EQ. 5)
50
100
10
20
200
500 1,000 2,000
1
2
5
10
20
50
100
200
500
1,000
R
T
-
CHANNEL OSCILLATOR FREQUENCY, F
SW
, [kHz]
FIGURE 5. OSCILLATOR FREQUENCY vs R
T
OC
+
-
I
TOTAL
+
ISEN1
I
TRIP
82.5
μ
A
FIGURE 6. INTERNAL OVERCURRENT DETECTION
CIRCUITRY
∑
n
n = ACTIVE CHANNELS
ISEN4
ISL6558
ISEN3
ISEN2
+
+
+
0V
0A
0V
FIGURE 7. OVERCURRENT OPERATION
10ms/DIV
I
OUT
(5A/DIV)
V
OUT
(1V/DIV)
SHORT APPLIED
SHORT REMOVED
PGOOD (5V/DIV)
ISL6558
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6558IBZ-T | Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning |
| ISL6558IBZA | Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning |
| ISL6558IBZA-T | Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning |
| ISL6558EVAL1 | Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning |
| ISL6558EVAL2 | Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6558IBZ-T | 功能描述:IC REG CTRLR BUCK PWM 16-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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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) |
| ISL6558IR | 功能描述:IC REG CTRLR BUCK PWM 20-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: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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6558IR-T | 功能描述:IC REG CTRLR BUCK PWM 20-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: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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6558IRZ | 功能描述:IC REG CTRLR BUCK PWM 20-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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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) |
| ISL6558IRZA | 功能描述:IC REG CTRLR BUCK PWM 20-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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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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