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AS2845

Features: • 2.5 V bandgap reference trimmed to 1.0% and temperature-compensated• Extended temperature range from - 40 to 105° C• AS2842/3 oscillations trimmed for precision duty cycle clamp• AS2844/5 have exact 50% max duty cycle clamp• Advanced oscillator design simp...

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SeekIC No. : 004288271 Detail

AS2845: Features: • 2.5 V bandgap reference trimmed to 1.0% and temperature-compensated• Extended temperature range from - 40 to 105° C• AS2842/3 oscillations trimmed for precision duty cy...

AS2845 Data Sheet

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Part Number:
AS2845
Supply Ability:
5000

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

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Upload time: 2024/11/12

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Product Details

Description



Features:

• 2.5 V bandgap reference trimmed to 1.0% and temperature-compensated
• Extended temperature range from - 40 to 105° C
• AS2842/3 oscillations trimmed for precision duty cycle clamp
• AS2844/5 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
• Over-temperature shutdown


Pinout

Connection Diagram


Specifications

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



Description

The AS2842 family of control ICs provide pin-for-pin replacement of the industry standard UC3842 series of devices.AS2845 are redesigned to provide significantly improved tolerances in power supply manufacturing. The 2.5 V reference has been trimmed to 1.0% tolerance. The oscillator discharge current of AS2845 is trimmed to provide guaranteed 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 synchronization input that can be easily driven from open collector/open drain logic outputs. This sync input of AS2845  is a high impedance input and can easily be used for externally clocked systems. The new flip-flop topology allows the duty cycle on the AS2844/5 to be guaranteed between 49 and 50%. The AS2843/5 requires less than 0.5 mA of start-up current over the full temperature range.




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