参数资料
型号: ISL1801IVZ
厂商: Intersil
文件页数: 22/29页
文件大小: 0K
描述: IC CONV SOLAR PWR 48TSSOP
标准包装: 390
应用: 转换器,太阳能
输入电压: 9 V ~ 90 V
输出数: 4
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-TFSOP(0.240",6.10mm 宽)
供应商设备封装: 48-TSSOP
包装: 管件
ISL1801
VIN1
Pre_load
PWM1
PVCC3
Timer
V th2
OFF
LDO2
ON
OFF
4.5V
VCC5V
POR
PWM2
Vout2
PGOOD2
OPAMP,
COMPARATOR
Enabled
Disabled
DRIVER3/
BDRIVE
Enabled
GND
GND
Disabled
PWM3
t 0
t 1
t 2
t 3
FIGURE 27. POWER-DOWN SEQUENCE
Power-Down Sequence
Before t 0 , the system runs in normal mode;
t 0 : PVCC3 drops below V th2 , both drivers’ outputs are pulled to
GND; MCU should stop sending PWM signal; both VR1 and
VR2 continue operating;
t 1 : PVCC3 returns above V th2 , both drivers are ready to run;
t 2 : PVCC3 drops below V th2 , both drivers’ outputs are pulled to
GND; both VR1 and VR2 continue operating;
t 3 : PVCC3 drops to a very low level and VCC5V drops below the
POR level (4.5V); the IC shuts down and all internal circuits
are disabled.
When VCC1 drops below 6V, the VR1 power stage stops
operating. The VR1 control circuit will still run until VCC5V drops
below the 90% * VCC5 (4.5V) POR threshold;
22
Over-Temperature Protection
Over-temperature protection (OTP) is placed on the HV die.
Temperature higher than +150°C (typical) will trip the OTP disabling
VR1, VR2 and the MOSFET drivers. When the temperature
decreases to +135°C (typical), the ISL1801 will restart.
Overvoltage Protection
VR1 and VR2 include overvoltage protection (OVP).
When the VR1 output voltage feedback is higher than 120% of
V REF1 , the PWM output will be tri-stated and at the same time
the PRELOAD current will be applied to V OUT1 to discharge the
output. When V OUT1 is discharged and FB1 reaches V REF1 the
OCP will turn off and normal PWM operation will resume.
When the VR2 output voltage feedback is higher than 120% of
V REF2 , the PWM output will be tri-stated. After V OUT2 falls so that
FB2 is equal to V REF2 the OCP will turn off and normal PWM
operation will resume.
FN8259.0
June 29, 2012
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