AS3819T, AS3842, AS3842A Selling Leads, Datasheet
MFG:ALPHA* Package Cooled:TO263*3 D/C:98*
AS3819T, AS3842, AS3842A Datasheet download
Part Number: AS3819T
MFG: ALPHA*
Package Cooled: TO263*3
D/C: 98*
AS3819T, AS3842, AS3842A
- Table of contents:
Info of AS3819T
Info of AS3842
Info of AS3842A
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About AS300
PDF/DataSheet Download
Datasheet: AS300
File Size: 69720 KB
Manufacturer: ETC [ETC]
Download : Click here to Download
About AS3842
PDF/DataSheet Download
Datasheet: AS3842
File Size: 159170 KB
Manufacturer: ETC [ETC]
Download : Click here to Download
About AS300
PDF/DataSheet Download
Datasheet: AS300
File Size: 69720 KB
Manufacturer: ETC [ETC]
Download : Click here to Download
AS3842 General Description
The AS3842 family of control ICs provide pin-for-pin replacement of the industry standard UC3842 series of devices. The devices are 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 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 AS3844/5 to be guaranteed between 49 and 50%. The AS3843/5 requires less than 0.5 mA of start-up cur-rent over the full temperature range.
AS3842 Maximum Ratings
| 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 |
AS3842 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
AS3842 Connection Diagram
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