OR-MOC30XX Thyristor Optocoupler Product Introduction

Product list

Non-zero cross product	VDRM ≥ 400V	VDRM ≥ 600V	VDRM ≥ 800V	Customers are recommended to use electric current
IFT ≤ 20mA	OR-MOC3020	OR-MOC3050	OR-MOC3070	Trigger device current≥20mA
IFT ≤ 15mA	OR-MOC3021	OR-MOC3051	OR-MOC3071	Trigger device current≥15mA
IFT ≤ 10mA	OR-MOC3022	OR-MOC3052	OR-MOC3072	Trigger device current≥10mA
IFT ≤ 5mA	OR-MOC3023	OR-MOC3053	OR-MOC3073	Trigger device current≥5mA
IFT ≤ 3mA	OR-MOC3024	OR-MOC3054	OR-MOC3074	Trigger device current≥3mA

 

Zero cross product	VDRM ≥ 400V	VDRM ≥ 600V	VDRM ≥ 800V	Recommended current for customers
IFT ≤ 20mA	OR-MOC3040	OR-MOC3060	OR-MOC3080	Trigger device current≥20mA
IFT ≤ 15mA	OR-MOC3041	OR-MOC3061	OR-MOC3081	Trigger device current≥15mA
IFT ≤ 10mA	OR-MOC3042	OR-MOC3062	OR-MOC3082	Trigger device current≥10mA
IFT ≤ 5mA	OR-MOC3043	OR-MOC3063	OR-MOC3083	Trigger device current≥5mA
IFT ≤ 3mA	OR-MOC3044	OR-MOC3064	OR-MOC3084	Trigger device current≥3mA

 

Electrical Introduction

1.Trigger current（ IFT ）

Trigger current (IFT) is the minimum current required at the input when the output is switched on and triggered, which is an important parameter to be considered in customer circuit applications.

Therefore, in the design, the triggering current given by the circuit to the thyristor optocoupler must be larger than the IFT of the  thyristor optocoupler to ensure that the optocoupler can be triggered normally.

 

i.Effect of temperature on IFT

As shown in Figure 1, the effect of temperature on IFT is that if the temperature continues to rise, the IFT will show a slow downward trend over the specification range.

FIG. 1 Effect of temperature on IFT

 

2.Critical rise rate of off-state voltage (dv/dt)

The critical rise rate of the off-state voltage of the thyristor optocoupler is shown as follows.

dv/dt=0.63×E1/τ  unit  V/μS

       τ=RW×C unit μS

E1：VDM=2/3VDRM ，RW：Adjustable resistance ，C：Capacitors for generating exponential waveforms

From this formula, it can be seen that the dv/dt parameter is mainly an important parameter of the output thyristor  chip itself, which affects the application performance of the packaged optocoupler.

 

                                                                                                           FIG. 2 Schematic diagram of dv/dt test

 

3.Other parameters introduction.

1)Off-state repeat peak current IDRM: When the output is in the blocked state and under the off-state repeat peak voltage VDRM, the forward and reverse peak leakage current passes through the output.

2)Peak on-state voltage VTM: When the output terminal is in the on-state state, the voltage through the output terminal is called the peak on-state voltage.

3) Maintenance current IH: After the thyristor optocoupler output terminal is switched on, the minimum current necessary to keep the output terminal continuously in the on-state.

 

Circuit recommendation

Thyristor photocouplers can be isolated for AC load control, provided the load is relatively small (about 50 mA or less). For larger currents (up to a few amps), a SCR photocoupler is combined with a high-power SCR for AC load control. The following diagram shows the basic circuit configuration. Rs and Cs are elements of the buffer circuit that prevent the thyristor photocoupler switch failure by shielding noise, while the varistor absorbs any surge voltage from the power line.

Figure 3 Single thyristor photocoupler control circuit

Figure 4 Thyristor optocoupler and high-power thyristor control circuit

Recommended Rs/Cs values:

AC100V: RS=47Ω、CS=0.033μF 

AC200V: RS=100Ω、CS=0.1μF

 

Application field

Small household appliances: blower, health pot, dimming light, speed fan, combination sound, toy device, radio remote control, etc

Large household appliances: air conditioner, TV, refrigerator, washing machine, acousto-optic circuit, timing controller, camera and industrial control, etc

                                                         FIG. 5 SCR application principle diagram of blower

 

 

                                             FIG. 6 Principle diagram of thyristor application of dimming lamp