PPR

      PPR is small size polypropylene film capacitors for high pulse current applications.PPR is also a snubber capacitor for energy conversion in power semiconductor circuits.It is characterized by SCR commutation.PPR is applied to TV Deflection Circuits,SMPS Protection Circuits,Electronic Ballasts and other high pulse current applications.
      The following is about the general specification of PPR.Operating Temperature Range should be from -55°C to +105°C.Capacitance Tolerance is +/- 10% at 1kHz and 20°C.There are also some description about rated voltage of MWS.VDC is 630V corresponding to VAC is 400V.VDC is 1000V corresponding to VAC is 600V.VDC is 1600V corresponding to VAC is 650V.VDC is 2000V corresponding to VAC is 700V.For T>85°C VDC must be rated by 1.25% for every °C above 85°C.For T>75°C VAC must be rated by 1.35% for every °C above 75°C.Dissipation factor(max) should be 0.03% at 20°C when Freq is 1 kHz and C0.1F.Dissipation factor(max) should be 0.05% at 20°C when Freq is 10kHz and C0.1F.Dissipation factor(max) should be 0.15% at 20°C when Freq is 100 kHz and C0.1F. Dissipation factor(max) should be 0.03% at 20°C when Freq is 1 kHz and 0.1F>C1F.Dissipation factor(max) should be 0.06% at 20°C when Freq is 10kHz and 0.1F>C1F.Dissipation factor(max) should be 0.04% at 20°C when Freq is 1 kHz and C>1F.Insulation resistance@20°C(<70% RH)for 1 minute at 100VDC is 100,000M when C0.33F.Insulation resistance@20°C(<70% RH)for 1 minute at 100VDC is 30,000M x F when C>0.33F.
Dielectric Strength is 160% of rated VDC for 2 seconds at 20°C between leads.It is about load life test.Aging is 2000 hours at 85°C±2°C with 125% of rated voltage Under the condition of capacitance change 2% change from initial value,dissipation factor 0.1% at 10kHz and 25°C for C1F or dissipation factor0.1% at 1kHz and 25°C for C>1F,insulation resistance 50% of specified value.Self inductance  is less than 1nH/mm of capacitor lead spacing.
Capacitance drift  should be less than 0.5% up to 40°C after 2 years.Temperature coefficient is -200ppm/°C or +/- 100ppm/°C.Reliability is 1FIT(fit=1x109 Failures/component hours.Applied Voltage=0.5xVDC Temperature=+40°C±2°C)under the condition of capacitance change10% change from initial value,dissipation factor >2x initial specified value and Insulation Resistance <0.005x initial specified value.Dielectric is polypropylene.Electrodes is vacuum deposited metal layers.Construction is extended double metallized carrier film, internal series connections and metallized film.Leads are tinned copper leads.Coating is made of solvent resistant plastic box (UL 94V-1) with epoxy end fills (UL 94V-0).