Description

TLP250 Price in Pakistan | TLP250H Mosfet IGBT Driver

The TLP250 or TLP250H is a popular Optocupillar (or opto-isolator) manufactured by Toshiba. It is designed to provide electrical isolation between two circuits while allowing signal transmission using light.Chip.pk give best Tlp250 price in pakistan.Here are its key features and details:

Key Features of TLP250H:

1. Isolation Voltage: 2500 Vrms (min) – Provides high-voltage isolation between input and output.
2. High-Speed Switching: Suitable for driving IGBTs and MOSFETs in power electronics applications.
3. Built-in Gate Driver: Contains an integrated buffer (amplifier), making it suitable for driving power devices directly.
4. Supply Voltage Range:
   • Input side (LED): 5V to 20V (forward current typically 5-10mA).
   • Output side (photodetector + driver): 15V to 30V (for driving MOSFET/IGBT gates).
5. Output Current: Up to ±1.5A peak (enough for small to medium power switches).
6. Package: Typically comes in an 8-pin DIP (Dual Inline Package).

Applications:

• Motor drives
• Inverters & SMPS (Switch-Mode Power Supplies)
• IGBT/MOSFET gate driving
• Industrial control systems (isolating logic from power stages)

Why Use TLP250H?

• Provides galvanic isolation, preventing noise or high voltages from affecting control circuits.
• Simplifies circuit design by integrating a gate driver (no need for an external buffer).
• Reliable and widely used in power electronics.

Pin Configuration (8-Pin DIP):

Alternatives:

• HCPL-3120 (Avago, higher current)
• PC817 (Simpler, lower power)
• 6N137 (High-speed logic isolation)

The TLP250 or TLP250H is a high-speed, high-voltage optocoupler with an integrated gate driver, widely used in power electronics for isolating and driving MOSFETs and IGBTs. Below is a detailed breakdown of its specifications, working principle, typical applications, and design considerations.

1. TLP250 Key Specifications

2. Internal Structure & Working Principle

The TLP250 consists of:

• Input Side: Infrared LED (emitter) that turns on when current flows.
• Output Side:
  • Photodiode array (detects light from LED).
  • Integrated buffer amplifier (boosts signal to drive power switches).
  • Totem-pole output (provides push-pull drive for fast switching).

How It Works:

1. When a forward current (5–20mA) flows through the LED (Pins 1-2), it emits infrared light.
2. The photodiode array on the output side detects this light and generates a current.
3. The built-in amplifier converts this into a strong gate drive signal (up to ±1.5A).
4. The output (Pin 6) switches between V_CC and GND to control the MOSFET/IGBT.

3. Typical Applications

A. IGBT/MOSFET Gate Driving

• Used in inverters, motor drives, and SMPS to isolate control circuits from high-voltage power stages.
• Example: Driving an IGBT in a 3-phase inverter.

B. Isolated Power Supply Control

• Provides safe isolation in flyback converters, buck/boost converters.

C. Industrial Automation

• Used in PLC systems, servo drives, and relay control where noise immunity is critical.

4. Design Considerations

A. Input Side (LED)

• Current-limiting resistor (R_in) is required:���=�������−����Rin​=IF​Vsupply​−VF​​Example: If �������=5�Vsupply​=5V, ��=1.5�VF​=1.5V, ��=10��IF​=10mA:���=5�−1.5�10��=350Ω(Use 330Ω standard)Rin​=10mA5V−1.5V​=350Ω(Use 330Ω standard)

B. Output Side (Gate Drive)

• Gate resistor (R_G) is needed to prevent oscillations:
  • Typical range: 10Ω–100Ω.
  • Higher R_G slows switching (reduces EMI but increases losses).
• Bypass capacitor (0.1µF–1µF) near V_CC (Pin 5/7) to reduce noise.

C. Power Supply Considerations

• V_CC (15V–30V) must be stable (use a regulator if needed).
• Negative voltage spikes can damage the output; use fast recovery diodes if needed.

5. Advantages & Limitations

✔ Advantages

• Integrated gate driver (no need for external buffer).
• High-speed switching (suitable for PWM applications).
• High isolation voltage (2500V) for safety.

✖ Limitations

• Peak output current (1.5A) may be insufficient for large IGBTs (use external booster like TLP250 + discrete transistors).
• Not suitable for very high-frequency (>500kHz) switching.

6. Example Circuit (Driving a MOSFET)

         +5V                     +15V (VCC)
          |                        |
          ⏚                        ⏚
          |                        |
         [330Ω]                   [100nF]
          |                        |
IN ----->|1  TLP250  8| NC        GATE ----> MOSFET
          |2          7| VCC
GND ----->|4          6| OUTPUT
          |3          5| VCC
          NC           |

7. Alternatives to TLP250H

Conclusion

The TLP250H is a versatile, cost-effective optocoupler with a built-in gate driver, making it ideal for medium-power switching applications. Proper design (gate resistor, bypass capacitor) ensures reliable performance,So Hurry Up!Buy Best TLP250H or TLP250 Price in Pakistan Only From Chip.pk.

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