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UC2843BDG Current-Mode PWM Controller 500kHz Operation High Drive Output Wide 8V-30V Input Precision Reference Low Cost Robust Protection Versatile for Power Supplies
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Features
andbull; Trimmed Oscillator for Precise Frequency Control
andbull; Oscillator Frequency Guaranteed at 250 kHz
andbull; Current Mode Operation to 500 kHz
andbull; Automatic Feed Forward Compensation
andbull; Latching PWM for Cycleandminus;Byandminus;Cycle Current Limiting
andbull; Internally Trimmed Reference with Undervoltage Lockout
andbull; High Current Totem Pole Output
andbull; Undervoltage Lockout with Hysteresis
andbull; Low Startup and Operating Current
andbull; This is a Pbandminus;Free and Halideandminus;Free Device
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Applications
1:Off-line switching power supplies (AC-DC converters): Power adapters (e.g., laptops, monitors), industrial power systems, consumer electronics (TVs, audio equipment).
2:DC-DC converters: Boost converters (battery voltage step-up), flyback converters (isolated power supplies up to 100W-150W).
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Description
The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Offandminus;Line and DCandminus;DC converter applications offering the designer a costandminus;effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycleandminus;byandminus;cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
These devices are available in an 8andminus;pin dualandminus;inandminus;line and surface mount (SOICandminus;8) plastic package as well as the 14andminus;pin plastic surface mount (SOICandminus;14). The SOICandminus;14 package has separate power and ground pins for the totem pole output stage.
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for offandminus;line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
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INFORMATION
| Category | andnbsp; | |
| Manufacturer | onsemi | andnbsp; |
| Series | - | andnbsp; |
| Packaging | Tube | andnbsp; |
| Part Status | Obsolete | andnbsp; |
| Output Type | Transistor Driver | andnbsp; |
| Function | Step-Up, Step-Up/Step-Down | andnbsp; |
| Output Configuration | Positive, Isolation Capable | andnbsp; |
| Topology | Boost, Flyback | andnbsp; |
| Number of Outputs | 1 | andnbsp; |
| Output Phases | 1 | andnbsp; |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 30V | andnbsp; |
| Frequency - Switching | Up to 500kHz | andnbsp; |
| Duty Cycle (Max) | 96% | andnbsp; |
| Synchronous Rectifier | No | andnbsp; |
| Clock Sync | No | andnbsp; |
| Serial Interfaces | - | andnbsp; |
| Control Features | Frequency Control | andnbsp; |
| Operating Temperature | -25anddeg;C ~ 85anddeg;C (TA) | andnbsp; |
| Mounting Type | Surface Mount | andnbsp; |
| Package / Case | 14-SOIC (0.154andquot;, 3.90mm Width) | andnbsp; |
| Supplier Device Package | 14-SOIC | andnbsp; |
| Base Product Number |
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