Overview
The UC2842BD1R2, produced by onsemi, is a high-performance current mode PWM controller designed for off-line and DC-DC converter applications. This integrated circuit is part of the UC284xB family and offers a cost-effective solution with minimal external components. It features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output ideal for driving power MOSFETs.
The device includes protective features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. It is available in various package options, including 8-pin dual-in-line and surface mount (SOIC-8) as well as 14-pin surface mount (SOIC-14) packages.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | - | - | 30 | V |
| Total Power Supply and Zener Current | ICC + IZ | - | - | 30 | mA |
| Output Current, Source or Sink | IO | - | - | 1.0 | A |
| Output Energy (Capacitive Load per Cycle) | W | - | - | 5.0 | µJ |
| Reference Output Voltage | Vref | 4.95 | 5.0 | 5.05 | V |
| Line Regulation | Regline | -2.0 | - | 20 | mV |
| Load Regulation | Regload | -3.0 | - | 25 | mV |
| Temperature Stability | TS | -0.2 | - | - | mV/°C |
| Output Voltage Low State | VOL | 0.1 | 0.4 | 1.6 | V |
| Output Voltage High State | VOH | 12 | 13.5 | 13.5 | V |
| Operating Junction Temperature | TJ | -40 | - | 150 | °C |
| Storage Temperature Range | Tstg | -65 | - | 150 | °C |
Key Features
- Trimmed Oscillator: Allows for precise duty cycle control with the oscillator frequency programmed by the values chosen for the timing components RT and CT.
- Temperature-Compensated Reference: Provides stable reference output voltage across a wide temperature range.
- High-Gain Error Amplifier: Offers high gain and unity gain bandwidth, making it suitable for precise voltage regulation.
- Current Sensing Comparator: Enables cycle-by-cycle current limiting and protects against overcurrent conditions.
- High-Current Totem Pole Output: Ideal for driving power MOSFETs with high current capability.
- Protective Features: Includes input and reference undervoltage lockouts with hysteresis, programmable output deadtime, and a latch for single pulse metering.
- Package Options: Available in 8-pin dual-in-line and surface mount (SOIC-8) as well as 14-pin surface mount (SOIC-14) packages.
Applications
- Off-Line Converters: Suitable for designing off-line power supplies due to its high performance and protective features.
- DC-DC Converters: Ideal for DC-DC converter applications requiring precise current mode control.
- Power Supplies: Used in various power supply designs where high reliability and efficiency are required.
- Automotive and Industrial Systems: The NCV prefix versions are designed for automotive and other applications requiring site and change control.
Q & A
- What is the maximum supply voltage for the UC2842BD1R2?
The maximum supply voltage (VCC) is 30 V.
- What is the output current capability of the UC2842BD1R2?
The output current capability is ±1 A.
- What are the operating temperature ranges for the UC2842BD1R2?
The operating junction temperature range is -40°C to 150°C, and the storage temperature range is -65°C to 150°C.
- What protective features does the UC2842BD1R2 include?
The device includes input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
- How is the oscillator frequency programmed in the UC2842BD1R2?
The oscillator frequency is programmed by the values chosen for the timing components RT and CT.
- What is the reference output voltage of the UC2842BD1R2?
The reference output voltage (Vref) is typically 5.0 V, with a range of 4.95 V to 5.05 V.
- What are the package options available for the UC2842BD1R2?
The device is available in 8-pin dual-in-line and surface mount (SOIC-8) as well as 14-pin surface mount (SOIC-14) packages.
- What is the purpose of the high-gain error amplifier in the UC2842BD1R2?
The high-gain error amplifier is used for precise voltage regulation and offers high gain and unity gain bandwidth.
- Can the UC2842BD1R2 be used in automotive applications?
Yes, the NCV prefix versions are designed for automotive and other applications requiring site and change control.
- What is the maximum power dissipation at 25°C for the UC2842BD1R2 in an SOIC-8 package?
The maximum power dissipation at 25°C for the SOIC-8 package is 800 mW).
