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參數(shù)資料
| 型號： | ASM8I18S42ERG-08-SX |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, GREEN, SOIC-8 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 689K |
| 代理商： | ASM8I18S42ERG-08-SX |
ASM8P18S42ER
ASM8P18S43ER
December 2005
ASM8P18S45ER
rev 1.2
PWM Controller with EMI Reduction
3 of 11
Notice: The information in this document is subject to change without notice.
Application Information
Spread Spectrum Deviation
The deviation can be determined by selecting the proper
resistor at RSS to GND (Refer “RSS Resistor Vs. %
Modulation Depth Plot” for resistor selection)
PWM Frequency
The PWM frequency can be determined by selecting the
proper capacitance (CT) at the FSEL pin.
Start-up Current
ASM8P18xx allows a substantial reduction in the start up
current. Low start up current allows high resistance, lower
wattage start-up resistor, to supply controller start up
power.
Under Voltage Lockout (UVLO)
When the power supply voltage is below the start up
threshold voltage, internal circuitry puts the output into low
impedance state and sets the output to zero.
Thermal Shutdown
The output of ASM8P18xx goes down to zero when the
junction temperature of the device rises above 160°C. The
device automatically resumes operation when temperature
drops to 130°C. This protects the device from thermal
breakdown.
Overload and under current protection
ASM8P18xx provides cycle by cycle current limit and pulls
down PWM output to low as soon as ISNS pin senses a
peak voltage of 1V, with a delay to output of 125 nS
maximum.
At no load condition when the device senses the peak
voltage level of less than 0.1V at ISNS pin for a period of
200mS, the oscillator enters in to cycle skip mode. Normal
condition is restored once ISNS increases beyond 0.1V for
more than three cycles. Details of cycle skip for different
options are provided in the Electrical Characteristics table.
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
VDD
Supply Voltage
30
V
IDD
Supply Current
15
mA
IOUT
Maximum Output Current
1
A
ISNS
Current Sense Inputs and feedback
ISNS, FB, COMP
5
V
VOSC
Oscillator Voltage
4
V
VOUT
Output Voltage
30
V
Operation Junction Temperature
-45
150
°C
Storage Temperature
-65
150
°C
Lead Soldering Temperature (10 Seconds)
300
°C
HBM
2
KV
ESD Rating
MM
200
V
Note: For MicroSO Devices Maximum VDDMAX = 25V & IDDMAX =10mA
Package Thermal Resistance
8-Pin Plastic DIP (θJA)
125°C/W
8-Pin MicroSO (θJA)
250°C/W
8-Pin SO (θJA)
170°C/W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ASM8I18S42F-08-MX | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Voltage Mode PWM Controller with EMI Reduction |
| ASM8I18S42F-08-PX | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Voltage Mode PWM Controller with EMI Reduction |
| ASM8I18S42F-08-SX | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Voltage Mode PWM Controller with EMI Reduction |
| ASM8I18S43ERF-08-MX | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Voltage Mode PWM Controller with EMI Reduction |
| ASM8I18S43ERF-08-PX | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Voltage Mode PWM Controller with EMI Reduction |
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