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Description
Optocoupler - IC Output, 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 1 Mbps, DIP-8
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The parameters and performance indicators of this product are sourced from the internet. In case of discrepancies, please refer to the manufacturer's technical specifications!！
Description
● TLP550 constructs a high emitting diode and a one chip photo diode transistor.
● TLP550 has no base connection, and is suitable for application at noisy environmental condition.
● This unit is 8 lead DIP package.
Features
● Isolation voltage: 2500 Vrms (min.)
● Switching speed: tpHL, tpLH = 0.5μs (typ.)(RL=1.9 k)
● TTL compatible
● UL recognized: UL1577, file No. E67349 Pi
TLP550 is an optocoupler or an optical isolator designed and manufactured by Toshiba Electronics. Main purpose of an optocoupler is transfer digital signal between two circuits whilst electrically isolating before said two circuits. Optocouplers achieve this by optical means. One side of the optocoupler consist of a light source usually a LED is used. Other side consist of some type of optical receiver. So, when the input signal is connected to the input LED it will transmit the signal to the output optical receiver by optical means without using electrical connection between the input and output. There are several types of optocouplers classified by the receiver type and the feedback capabilities. TLP550 is line driver output type optocoupler which means TLP550 can generate actual signal in it’s output pin without any external component. TLP550 is recommended to use in feedback control of SMPS (Switch mode power supplies) and inverter circuits. TLP550 comes in 8 pin DIP package. You can see the pinout of the TLP550 in below image.
Lets identify some of the key features of the TLP550 optocoupler IC.
● 2500V RMS maximum isolation capabilities between input and output sides
● TTL signal conversion capabilities
● Low conversion times (falling edge – 5us and rising edge 6us)
● 25mA continuous forward current and 20mA pulse forward current LED
● -5V to 15V wide range of supply input voltage.
As mentioned earlier TLP550 is used for feedback applications of SMPS and inverters. Zero crossing detection of an AC mains voltage is also important in such application. Fallowing circuit diagram shows simple AC 220V zero crossing detection circuit using TLP550.
In this circuit 220V AC signal is directly applied to the input LED in series with a 51k resistor to protect the input LED from over current and over voltage. You can calculate the value of this resistor using Ohm’s law equation. When the input is connected, we can get the output digital signal from the output pin directly. A 10k resistor as pullup resistor to reduce any noise and floating signals. You should be careful to not to touch the input side of the TLP550 when the circuit is live as it involves mains voltage and it can be lethal.
| QUANTITY | UNIT PRICE | PLUS UNIT PRICE | TOTAL PRICE |
|---|---|---|---|
| ≥1: | US $0.72852 | US $0.65567 | US $0.65567 |
| ≥5: | US $0.54639 | US $0.49175 | US $2.45875 |
| ≥10: | US $0.38247 | US $0.34422 | US $3.44220 |
| ≥20: | US $0.36426 | US $0.32783 | US $6.55660 |
| ≥50: | US $0.32783 | US $0.29505 | US $14.75250 |
| ≥100: | US $0.31873 | US $0.28686 | US $28.68600 |
| ≥200: | US $0.30962 | US $0.27866 | US $55.73200 |
| ≥500: | US $0.30051 | US $0.27046 | US $135.23000 |
| ≥1000: | US $0.29141 | US $0.26227 | US $262.27000 |
Substitute (equivalent) Product
| Product Name | Description |
|---|---|
| TLP521-4 | 4-channel, high-speed photocoupler with a guaranteed CTR (Current Transfer Ratio) over a wide temperature range. Suitable for applications requiring multiple isolated signal channels. |
| 6N137 | High-speed digital isolator with a propagation delay of less than 50ns. It features a CMOS-compatible output stage and is ideal for high-frequency digital signal isolation. |
| HCPL-2630 | High-speed, high-voltage, and high-isolation optocoupler designed for power supply feedback and other industrial applications. It offers a high CTR and low input current requirement. |
| TLP290-4 | 4-channel, high-sensitivity photocoupler with a low input current and high CTR. Suitable for applications where low power consumption and high reliability are required. |
| ILQ1204 | Quad-channel, high-speed optocoupler with a wide operating temperature range and high common-mode rejection ratio. Ideal for use in industrial control systems and communication interfaces. |
Product Usage
The TLP550 is a phototransistor optocoupler, which is commonly used in various circuits where electrical isolation between input and output is required. Here are some typical applications and circuits that use the TLP550:
Power Supply Circuits:
Motor Control Circuits:
Industrial Automation:
Medical Equipment:
Communication Interfaces:
Audio Circuits:
Data Acquisition Systems:
Home Automation:
Here’s a simple example of how the TLP550 might be used in an isolated feedback circuit for a switch-mode power supply:
Required+Vcc
|
|--- R1 ---|<|--- Vout
| | (Photodiode)
| |
| |--- R2 --- GND
| |
| |---|>|--- C1 --- GND
| | (Phototransistor)
| |
| |--- R3 --- Error Amplifier (-)
| |
| |--- Vref
|
|--- PWM Controller
In this circuit, the TLP550 provides galvanic isolation between the secondary side (Vout) and the primary side (PWM controller), ensuring that the feedback signal is accurately transmitted without introducing any common-mode noise or interference.
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TLP550
TLP550 has several brands around the world that may have alternate names for TLP550 due to regional differences or acquisition. TLP550 may also be known as the following names:
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