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AS3842

Features: 2.5 V bandgap reference trimmed to 1.0% and temperature-compensated Standard temperature range extended to 105°CAS3842/3 oscillations trimmed for precision duty cycle clampAS3844/5 have exact 50% max duty cycle clampAdvanced oscillator design simplifies synchronizationImproved specs on...

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SeekIC No. : 004288322 Detail

AS3842: Features: 2.5 V bandgap reference trimmed to 1.0% and temperature-compensated Standard temperature range extended to 105°CAS3842/3 oscillations trimmed for precision duty cycle clampAS3844/5 have ...

AS3842 Data Sheet

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Part Number:
AS3842
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

2.5 V bandgap reference trimmed to 1.0% and temperature-compensated
Standard temperature range extended to 105°C
AS3842/3 oscillations trimmed for precision duty cycle clamp
AS3844/5 have exact 50% max duty cycle clamp
Advanced oscillator design simplifies synchronization
Improved specs on UVLO and hysteresis provide more predictable start-up and shutdown
Improved 5 V regulator provides better AC noise immunity
Guaranteed performance with current sense pulled below ground

 




Pinout

Connection Diagram


Specifications

Parameter min max Unit
Supply Voltage (I CC< 30 mA) VCC Self-Limiting V
Supply Voltage (Low Impedance Source) VCC 30 V
Output Current IOUT ±1 A
Output Energy (Capacitive Load)   5 J
Analog Inputs (Pin 2, Pin 3)   0.3 to 30 V
Error Amp Sink Current   10 mA
Maximum Power Dissipation PD
8L SOIC
8L PDIP
14L SOIC		   750 mW
1000mW
950 mW
Maximum Junction Temperature TJ 150 °C
Operating Temperature   0 to 150 °C
Storage Temperature Range TSTG 65 to 150 °C
Lead Temperature, Soldering 10 Seconds TL 300 °C



Description

The AS3842 family of control ICs provide pin-for-pin replacement of the industry standard UC3842 series of devices. The AS3842 is redesigned to provide significantly improved tolerances in power sup-ply manufacturing. The 2.5 V reference has been trimmed to 1.0% tolerance. The oscillator discharge current is trimmed to provide guar-anteed duty cycle clamping rather than specified discharge current.The circuit is more completely specified to guarantee all parameters impacting power supply manufacturing tolerances.


In addition, the oscillator and flip-flop sections have been enhanced to provide additional performance. The RT /CT pin now doubles as a syn-chronization input that can be easily driven from open collector/open drain logic outputs. This sync input of AS3842 is a high impedance input and can easily be used for externally clocked systems. The new flip-flop topol-ogy allows the duty cycle on the AS3842 to be guaranteed between 49 and 50%. The AS3842 requires less than 0.5 mA of start-up cur-rent over the full temperature range.




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