規格
| 屬性 | 價值 |
| Supplier | Texas Instruments |
| Package | Tape & Reel (TR),Cut Tape (CT) |
| ProductStatus | Active |
| OutputType | Transistor Driver |
| Function | Step-Up, Step-Up/Step-Down |
| OutputConfiguration | Positive |
| Topology | Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull |
| NumberofOutputs | 2 |
| OutputPhases | 1 |
| Voltage-Supply(Vcc/Vdd) | 7V ~ 35V |
| Frequency-Switching | 1Hz ~ 600kHz |
| DutyCycle(Max) | 49% |
| SynchronousRectifier | Yes |
| ClockSync | Yes |
| ControlFeatures | Enable, Frequency Control, Reset, Soft Start |
| OperatingTemperature | -25°C ~ 85°C (TA) |
| MountingType | Surface Mount |
| Package/Case | 18-SOIC (0.295, 7.50mm Width) |
概述
Description
The UC2526ADWTR is a current‑mode PWM controller IC from Texas Instruments (Unitrode heritage) used to regulate switch‑mode power supplies. It drives an external power transistor (MOSFET or BJT) and uses a current‑sense input plus an oscillator ramp to regulate duty cycle, typically with an optocoupler feedback loop from the output.
Key features (high level):
- Internal reference and error amplifier for feedback control
- Oscillator for switching frequency with soft‑start
- Current‑sense input for current‑mode control
- Undervoltage lockout and overcurrent protection
- Suitable for flyback, forward, and buck converters
Packaging:
- ADWTR indicates A‑grade device in a DW (8‑pin) package on Tape & Reel.
Typical applications:
- Off‑line/offline‑driven SMPS, power adapters, battery chargers, telecom supplies.
Note: for exact electrical specs (voltage range, frequency, current limit, pinout), consult the TI UC2526A datasheet and TI packaging guide.
Key features (high level):
- Internal reference and error amplifier for feedback control
- Oscillator for switching frequency with soft‑start
- Current‑sense input for current‑mode control
- Undervoltage lockout and overcurrent protection
- Suitable for flyback, forward, and buck converters
Packaging:
- ADWTR indicates A‑grade device in a DW (8‑pin) package on Tape & Reel.
Typical applications:
- Off‑line/offline‑driven SMPS, power adapters, battery chargers, telecom supplies.
Note: for exact electrical specs (voltage range, frequency, current limit, pinout), consult the TI UC2526A datasheet and TI packaging guide.
Features
Here are the key features of UC2526ADWTR (Unitrode/TI PWM controller):
- High‑voltage current‑mode PWM controller for off‑line and DC‑DC converters
- External MOSFET gate drive (totem‑pole output)
- Wide input range suitable for primary‑side operation
- Current‑mode control with slope compensation
- Fixed oscillator frequency with RT/CT programming
- Leading‑edge blanking on current sense
- Undervoltage lockout with hysteresis
- Soft‑start to limit inrush and output overshoot
- Overcurrent/short‑circuit protection (cycle‑by‑cycle) with latch and auto‑retry
- Fault protection with latch/auto‑retry
- Feedback via optocoupler and error‑amplifier input
- Thermal shutdown protection
- 8‑pin DWTR package (SOIC‑8 style)
Note: For exact electrical specs and recommended usage, please refer to the TI UC2526ADWTR datasheet.
- High‑voltage current‑mode PWM controller for off‑line and DC‑DC converters
- External MOSFET gate drive (totem‑pole output)
- Wide input range suitable for primary‑side operation
- Current‑mode control with slope compensation
- Fixed oscillator frequency with RT/CT programming
- Leading‑edge blanking on current sense
- Undervoltage lockout with hysteresis
- Soft‑start to limit inrush and output overshoot
- Overcurrent/short‑circuit protection (cycle‑by‑cycle) with latch and auto‑retry
- Fault protection with latch/auto‑retry
- Feedback via optocoupler and error‑amplifier input
- Thermal shutdown protection
- 8‑pin DWTR package (SOIC‑8 style)
Note: For exact electrical specs and recommended usage, please refer to the TI UC2526ADWTR datasheet.
Pinout
8 pins. It is a current‑mode PWM controller for switching power supplies.
Pinout (top view):
- 1: COMP (error amplifier output)
- 2: VREF (5 V reference)
- 3: FB (feedback input)
- 4: ISENSE (current-sense input)
- 5: RT/CT (timing resistor/capacitor)
- 6: GND
- 7: OUTPUT (drive to switch)
- 8: VCC (supply)
DWTR denotes the package (likely 8‑pin SOIC).
Pinout (top view):
- 1: COMP (error amplifier output)
- 2: VREF (5 V reference)
- 3: FB (feedback input)
- 4: ISENSE (current-sense input)
- 5: RT/CT (timing resistor/capacitor)
- 6: GND
- 7: OUTPUT (drive to switch)
- 8: VCC (supply)
DWTR denotes the package (likely 8‑pin SOIC).
Manufacturer
Manufacturer: Texas Instruments (TI).
TI is an American multinational technology company that designs and manufactures semiconductors and integrated circuits (analog, digital, and embedded processing). It is one of the world's largest chipmakers, headquartered in Dallas, Texas.
TI is an American multinational technology company that designs and manufactures semiconductors and integrated circuits (analog, digital, and embedded processing). It is one of the world's largest chipmakers, headquartered in Dallas, Texas.
Application
UC2526ADWTR is a high‑voltage, current‑mode PWM controller for switch‑mode power supplies. Typical applications:
- Offline AC‑DC power supplies (wall adapters, chargers)
- Isolated flyback and forward converters
- DC‑DC converters (buck/boost/buck‑boost) in consumer and telecom gear
- Constant‑current LED driver circuits
- Battery charging circuits
- Small power supplies for networking and industrial equipment
- Offline AC‑DC power supplies (wall adapters, chargers)
- Isolated flyback and forward converters
- DC‑DC converters (buck/boost/buck‑boost) in consumer and telecom gear
- Constant‑current LED driver circuits
- Battery charging circuits
- Small power supplies for networking and industrial equipment
Package
UC2526ADWTR comes in an 8-pin SOIC package (D package), Tape & Reel.
