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AAC142/143 and AAC242/243 |
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Current Mode PWM Controller
The AAC142/43 and AAC242/43 are four new controllers from ASIC Advantage, Inc., designed as upgrades on the workhorse UC1/2/3842 and UC1/2/3843 family of Current Mode PWM Controllers, available from various sources. The AAC142/43 and AAC242/43 are intended for Offline or DCDC power converter applications, offered as an ongoing expansion in Power Management and other Mixed Signal solutions available from ASIC Advantage, Inc.
Features in common with the x842/x843 design include current mode control, pulse-pulse current limiting, undervoltage lockout with hysteresis and an on-board voltage reference. In addition, as with the x842/x843 controllers, the AAC142 and AAC242 are differentiated from the AAC143 and AAC243 by their undervoltage lockout thresholds. The AAC142/242 have turnon/turn-off thresholds of 16V and 10V respectively, while the AAC143/243 thresholds are 8.4V and 7.6V respectively. The AAC143 and AAC243 are targeted for battery applications, based on their lower undervoltage and hysteresis levels. The lower V-ILimit
options of the AAC242/43 of 0.25V, as compared to the 1.0V for the AAC142/43, allow for lower current sense measurements.
Other features designed into this family of Current Mode Controllers are intended to enhance their functionality and range of use. The maximum Start-Up current is substantially lower than the x842/x843. Output drive rise and fall times of 50ns for the AAC142/43 and the AAC242/43 compare to 150ns maximum rise and fall times for the x842/x843. Other unique features of the AAC142/43 and AAC242/43 include an integrated soft-start function tied to the clock of the internal oscillator (approximately 330 cycles), leading edge current blanking of 100ns and a more robust, higher current MOS output drive stage capable of driving much higher source and sink currents. The enhancements in drive capability, as well as rise and fall times, enable the AAC142/43 and AAC242/43 to operate up to 1MHz vs. the 500kHz maximum typically ascribed for the x842/843.
Features - Pulse-Pulse Current Limiting, with 1V I-Limit Threshold (AAC142/43) or 0.25V I-Limit Threshold (AAC242/43)
- On-Chip Bandgap Voltage Reference
- AAC142 and AAC242 Undervoltage Lockout with Hysteresis for 16V Turn-on/10V Turn-off
- AAC143 and AAC243 Undervoltage Lockout with Hysterisis for 8.4V Turn-on/7.6V Turn-off
- Overvoltage Protection Zener
- Enhanced Rise and Fall Performance, Higher Current Output Drive Stage for Operation to 1MHz
- Peak Current Mode Control
- Integrated Soft-Start Function, (~330 Clock Cycles)
- Leading Edge Current Blanking for Reduced Filtering (100ns)
- Offered in RoHS Compliant 8-Pin SOIC, 8-Pin PDIP, and 3mm x 3mm DFN Packages
- Rated for Extended Industrial Temperature Range (-40° C to +105° C)
- Evaluation Boards Available (AAEV142/143/242/243)
Applications- Offline Power Converters
- DC/DC Converter
- LED Lighting
Ordering Information | Ordering PN(1) | Subgroup | Description | Temp. Range | Package | Packing Type | Packing Qty | | AACx42 E-D8A-G-LF | Controller | Current Mode PWM Controller, 16V Turn-on/10V Turn-off
| Ext. Industrial | 8-Pin DIP | Tube | 50 | | AACx42 E-S8A-G-LF | Controller | Current Mode PWM Controller, 16V Turn-on/10V Turn-off | Ext. Industrial | 8-Pin SOIC | Tube | 98 | | AACx42 E-S8A-G-LF-TR | Controller | Current Mode PWM Controller, 16V Turn-on/10V Turn-off | Ext. Industrial | 8-Pin SOIC | 13” T&R
| 2500 | AACx42 E-F8A-G-LF-W
| Controller | Current Mode PWM Controller, 16V Turn-on/10V Turn-off | Ext. Industrial | 3mm x 3mm 8-Pin DFN
| Waffle Pack
| TBD | AACx42 E-F8A-G-LF-TR
| Controller | Current Mode PWM Controller, 16V Turn-on/10V Turn-off | Ext. Industrial | 3mm x 3mm 8-Pin DFN | 13” T&R | TBD | | AACx43 E-D8A-G-LF | Controller | Current Mode PWM Controller, 8.4V Turn-on/7.6V Turn-off | Ext. Industrial | 8-Pin DIP | Tube | 50 | | AACx43 E-S8A-G-LF | Controller | Current Mode PWM Controller, 8.4V Turn-on/7.6V Turn-off | Ext. Industrial | 8-Pin SOIC | Tube | 98 | | AACx43 E-S8A-G-LF-TR | Controller | Current Mode PWM Controller, 8.4V Turn-on/7.6V Turn-off | Ext. Industrial | 8-Pin SOIC | 13” T&R
| 2500 | AACx43 E-F8A-G-LF-W
| Controller | Current Mode PWM Controller, 8.4V Turn-on/7.6V Turn-off | Ext. Industrial | 3mm x 3mm 8-Pin DFN | Waffle Pack | TBD | AACx43 E-F8A-G-LF-TR
| Controller | Current Mode PWM Controller, 8.4V Turn-on/7.6V Turn-off | Ext. Industrial | 3mm x 3mm 8-Pin DFN | 13” T&R | TBD |
(1) PN - Replace ‘x’ with ‘1’ for 1V I-Limit Version (AAC142/43) and ‘2’ for 0.25V I-Limit Version (AAC242/43)
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