Q67100-H8646 데이터 시트보기 (PDF) - Infineon Technologies
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Q67100-H8646 Datasheet PDF : 13 Pages
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PSB 2121
Application Informations
Undervoltage Lockout
The undervoltage lockout circuit protects the PSB 2121 and the power devices from inadequate
supply voltage. If VS is too low, the circuit disables this output driver. This ensures that all control
functions have been stabilized in the proper state when the turn on voltage (8 V) is reached, and it
prevents from the possibility of start up glitches. The undervoltage lockout is programmable by
connecting a Z-diode between VS and UV from 8 V up to 70 V. If UV is connected to VS the default
undervoltage lockout is 8 V.
Voltage Reference
The reference regulator of the PSB 2121 is based on a temperature compensated bandgap. This
circuitry is fully active at supply voltages above + 6.0 volts and provides up to 0.5 mA of load current
to external circuitry at + 4.0 volts. This reference has to be buffered by an external capacitor
> 0.5 µF.
Oscillator
The oscillator frequency is programmed by three components: RT, CT and RD as shown in figure 2.
The oscillator timing capacitor CT is charged by VREF through RT and discharged by RD. (RD is series-
connected with an internal 9 kΩ discharge-resistor.) So the rise-time and the fall-time of the
sawtooth oscillator can be programmed individually.
Figure 2
Semiconductor Group
8
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