- 您现在的位置：买卖IC网 > PDF目录15063 > ISL6559CB (Intersil)IC REG CTRLR BUCK PWM VM 28-SOIC PDF资料下载
参数资料
| 型号： | ISL6559CB |
| 厂商： | Intersil |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28-SOIC |
| 标准包装： | 26 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 4MHz |
| 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： | 0°C ~ 70°C |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
ISL6559
t DELAY = --------------------------------------------------- = 560 μ s
1.4 ( VID )
R FB 160 × 10 – 6
T SS
1 + -----------------------------------------
(EQ. 10)
outlines the interaction between the fault monitors and the
power good signal.
PGOOD
Following the delay, the soft start ramps linearly until V RAMP
reaches VID. For the system described above, this first linear
ramp will continue for approximately
UV
RAMP1 = ----------- – t DELAY
T SS
1.4
(EQ. 11
DAC
REFERENCE
+
350mV
-
POR
CIRCUIT
OC
-
+
90 μ A
I AVG
= 5.27ms
VDIFF
+
OV
OVP
-
The final portion of the soft-start sequence is the time
remaining after V RAMP reaches VID and before I RAMP gets to
zero. This is also characterized by a slight change in the slope
of the output voltage ramp which, for the current example,
exists for a time of
2.2V
FIGURE 10. POWER GOOD AND PROTECTION CIRCUITRY
t RAMP2 = T SS – t RAMP1 – t DELAY
(EQ. 12)
Power Good Signal
The power good pin (PGOOD) is an open-drain logic output
t DELAY t RAMP1
t RAMP2
= 2.34ms
This behavior is seen in the example in Figure 9 of a converter
switching at 500kHz. For this converter, R FB is set to 2.67k ?
leading to T SS = 4.0ms, t DELAY = 700ns, t RAMP1 = 2.23ms,
and t RAMP2 = 1.17ms.
VOUT, 500mV/DIV
EN, 5V/DIV
1ms/DIV
FIGURE 9. SOFT-START WAVEFORMS FOR ISL6559 BASED
MULTI-PHASE BUCK CONVERTER
NOTE: Switching frequency 500kHz and R FB = 2.67k ?
Fault Monitoring and Protection
The ISL6559 actively monitors voltage and current feedback
to detect fault conditions. Fault monitors trigger protective
measures to prevent damage to a microprocessor load. One
common power good indication signal is provided for linking
to external system monitors. The schematic in Figure 10
12
which indicates that the converter is operating properly and
the output voltage is within a set window. The under-voltage
(UV) and over-voltage (OV) comparators create the output
voltage window. The controller also takes advantage of
current feedback to detect output over-current (OC)
conditions. PGOOD pulls low during shutdown and releases
high during soft-start once the output voltage exceeds the
UV threshold. Once high, PGOOD will only transition low
when the controller is disabled or a fault condition is
detected. It will return high under certain circumstances
once a fault clears.
Under-Voltage Protection
The voltage on V DIFF is internally offset by 350mV before it
is compared with the DAC reference voltage. By positively
offsetting the output voltage, an UV threshold is created
which moves relative to the VID code. During soft-start, the
slow rising output voltage eventually exceeds the UV
threshold. Assuming the POR leg of the PGOOD NOR gate
has not detected an OC fault, the PGOOD signal will go
high.
If a fault condition arises during operation and the output
voltage drops below the UV threshold, PGOOD will
immediately pull low, but converter operation will continue.
PGOOD will return high once the output voltage surpasses
the UV threshold.
If the ISL6559 is disabled during operation, the PGOOD
signal will not pull low until the output voltage decays below
the UV threshold.
FN9084.8
December 29, 2004
相关PDF资料 |
PDF描述 |
|---|---|
| X4043PIZ-4.5A | IC SUPERVISOR CPU 4K EE 8-DIP |
| ISL6558IR | IC REG CTRLR BUCK PWM 20-QFN |
| X4043PIZ-2.7A | IC SUPERVISOR CPU 4K EE 8-DIP |
| ISL6558IB-T | IC REG CTRLR BUCK PWM 16-SOIC |
| ISL6558IB | IC REG CTRLR BUCK PWM 16-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ISL6559CBZ-T | 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 |
| ISL6559CR | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 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) |
| ISL6559CR-T | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 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) |
发布紧急采购，3分钟左右您将得到回复。