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U210B Dataheets PDF



Part Number U210B
Manufacturers TEMIC Semiconductors
Logo TEMIC Semiconductors
Description Phase Control Circuit - Load Current Feedback Applications
Datasheet U210B DatasheetU210B Datasheet (PDF)

TELEFUNKEN Semiconductors U 210 B / U 210 B–FP Phase Control Circuit – Load Current Feedback Applications Technology: Bipolar Features D Externally controlled integrated amplifier D Variable soft start D Automatic retriggering D Voltage and current synchronisation D Triggering pulse typ. 125 mA D Internal supply voltage monitoring D Temperature constant reference source D Current requirement ≤ 3 mA Case: DIP 14, SO 16 Figure 1 Block diagram Preliminary Information 1 U 210 B / U 210 B–FP .

  U210B   U210B



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TELEFUNKEN Semiconductors U 210 B / U 210 B–FP Phase Control Circuit – Load Current Feedback Applications Technology: Bipolar Features D Externally controlled integrated amplifier D Variable soft start D Automatic retriggering D Voltage and current synchronisation D Triggering pulse typ. 125 mA D Internal supply voltage monitoring D Temperature constant reference source D Current requirement ≤ 3 mA Case: DIP 14, SO 16 Figure 1 Block diagram Preliminary Information 1 U 210 B / U 210 B–FP TELEFUNKEN Semiconductors Figure 2 Block diagram with external circuitry Open loop control with load current compensation 2 Preliminary Information TELEFUNKEN Semiconductors U 210 B / U 210 B–FP Description Mains supply The U 210 B is fitted with voltage limiting and can therefore be supplied directly from the mains. The supply voltage between Pin 2 (+pol/ă) and Pin 3 builds up across D1 and R1 and is smoothed by C1. The vaIue of the series resistance can be approximated using: R1= VM–VS 2 IS Further information regarding the design of the mains supply can be found in the data sheets in the appendix. The reference voltage source on Pin 13 of typ. –8.9 V is derived from the supply voltage. It represents the reference level of the control unit. Operating using an externally stabiIised DC voltage is not recommended. If the supply cannot be taken directly from the mains because the power dissipation in R1 would be too large, then the circuit shown in the following Figure 3 should be employed. Figure 3 Supply voltage for high current requirements Phase control The function of the phase control is largely identical to that of the well known components U 111 B and TEA 1007. The phase angle of the trigger pulse is derived by comparing the ramp voltage, which is mains synchronised by the voltage detector, with the set value on the control input Pin 9. The slope of the ramp is determined by C2 and its charging current. The charging current can be varied using R2 on Pin 5. The maximum phase angle amax can also be adjusted using R2. When the potential on Pin 6 reaches the nominal value predetermined at Pin 9, then a trigger pulse is generated whose width tp is determined by the value of C2 (the value of C2 and hence the pulse width can be evaluated by assuming 8 ms/nF). At the same time, a latch is set, so that as long as the automatic retriggering has not been activated, then no more pulses can be generated in that half cycle. The current sensor on Pin 1 ensures that, for operation with inductive loads, no pulse will be generated in a new half cycle as long as current from the previous half cycle is still flowing in the opposite direction to the supply voltage at that instant. This makes sure that ”Gaps” in the load current are prevented. The control signal on Pin 9 can be in the range 0 V to –7 V (reference point Pin 2). If Vpin9 = –7 V then the phase angle is at maximum = amax i .e. the current flow angle is a minimum. The minimum phase angle amin is when Vpin9 = Vpin2. Voltage monitoring As the voltage is built up, uncontrolled output pulses are avoided by internal voltage surveillance. At the same time, all of the latches in the circuit (phase control, soft start) are reset and the soft–start capacitor is short circuited. Used with a switching hysteresis of 300 mV, this system guarantees defined start–up behaviour each time the supply voltage is switched on or after short interruptions of the mains supply. 3 Preliminary Information U 210 B / U 210 B–FP Soft–start TELEFUNKEN Semiconductors As soon as the supply voltage builds up (t1), the integrated soft–start is initiated. The figure below shows the behaviour of the voltage across the soft–start capacitor and is identical with the voltage on the phase control input on Pin 9. This behaviour allows a gentle start–up for the motor. Figure 4 Soft–start C3 is first charged with typ. 30 mA. The charging current then increases as the voltage across C4 increases giving a progressively rising charging function with more and more strongly accelerates the motor with increasing rotational speed. The charging function determines the acceleration up to the set point. The charging current can have a maximum value of 85 mA. Control amplifier The integrated control amplifier with differential input has a bipolar current output, with typically ±110 mA at Pin 9 and a transmittance of typ. 1000 mA/V. The amplification and frequency response are determined by external circuit. For operation as a power control, it should be connected with Pin 7. Phase angle of the firing pulse can be adjusted by using the voltage at Pin 8. An internal limiting circuit prevents the voltage on Pin 9 becoming more negative than V13 + 1 V. Load current detection, Figure 2 Voltage drop across R8, dependent of load current, generates an input–current at Pin 11 limited by R5. Proportional output current of 0.44 x I11 (CTR) is available at Pin 12. It is proportional with respect to phase and amplitude of.


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