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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
Features
• Trimmed Oscillator for Precise Frequency Control
• Oscillator Frequency Guaranteed at 250 kHz
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle−By−Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
• This is a Pb−Free and Halide−Free Device
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).
Description
The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and DC−DC converter applications offering the designer a cost−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, cycle−by−cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
These devices are available in an 8−pin dual−in−line and surface mount (SOIC−8) plastic package as well as the 14−pin plastic surface mount (SOIC−14). The SOIC−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 off−line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
INFORMATION
| Category | | |
| Manufacturer | onsemi | |
| Series | - | |
| Packaging | Tube | |
| Part Status | Obsolete | |
| Output Type | Transistor Driver | |
| Function | Step-Up, Step-Up/Step-Down | |
| Output Configuration | Positive, Isolation Capable | |
| Topology | Boost, Flyback | |
| Number of Outputs | 1 | |
| Output Phases | 1 | |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 30V | |
| Frequency - Switching | Up to 500kHz | |
| Duty Cycle (Max) | 96% | |
| Synchronous Rectifier | No | |
| Clock Sync | No | |
| Serial Interfaces | - | |
| Control Features | Frequency Control | |
| Operating Temperature | -25°C ~ 85°C (TA) | |
| Mounting Type | Surface Mount | |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | |
| Supplier Device Package | 14-SOIC | |
| Base Product Number |
Drawing
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