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参数资料
| 型号： | ISL6558IRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-QFN |
| 标准包装： | 1,000 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 75% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-VQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6558
PWM1, 5V/DIV
ISL6558
ISEN1
0V
0V
PWM2, 5V/DIV
OC
+
-
I TOTAL
I TRIP
+
∑
n
+
+
ISEN2
+ ISEN3
0V
PWM3, 5V/DIV
PWM4, 5V/DIV
82.5 μ A
n = ACTIVE CHANNELS
ISEN4
FIGURE 6. INTERNAL OVERCURRENT DETECTION
0V
1ms/DIV
FIGURE 4. FOUR ACTIVE CHANNEL PWM DRIVE SIGNALS
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 .
0V
0A
CIRCUITRY
V OUT (1V/DIV)
SHORT APPLIED
I OUT (5A/DIV)
SHORT REMOVED
R T = 10
10.9 – 1.1 log F
SW
(EQ. 5)
0V
PGOOD (5V/DIV)
10ms/DIV
Figure 5 provides a graph of oscillator frequency vs R T . The
maximum recommended channel frequency is 1.5MHz.
1,000
500
200
100
50
20
10
5
2
1
FIGURE 7. OVERCURRENT OPERATION
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
10
20
50 100
200 500 1,000 2,000
lower MOSFET and provides current feedback proportional
CHANNEL OSCILLATOR FREQUENCY, F SW , [kHz]
FIGURE 5. OSCILLATOR FREQUENCY vs R T
10
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 .
FN9027.12
June 21, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6558IRZ-TKR5240 | 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6558IRZ-TR5240 | 功能描述:IC REG CTRLR BUCK PWM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6559CB | 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6559CB-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6559CBZ | 功能描述:电流型 PWM 控制器 2 TO 4 PHS BUCK CNTRLR 2 8LD RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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