EPR-00011 - 70 W Adapter 22-Jan-01
Page 16 of 46
Power Integrations Inc
Tel: +1 408 414 9200 Fax: +1 408 414 9201
ww: http://www.powerint.com
DC INPUT VOLTAGE
PARAMETERS
VMIN 82 Volts Minimum DC Input Voltage
VMAX 375 Volts Maximum DC Input Voltage
CURRENT WAVEFORM SHAPE
PARAMETERS
DMAX 0.62 Maximum Duty Cycle
IAVG 1.00 Amps Average Primary Current
IP 2.32 Amps Peak Primary Current
IR 1.39 Amps Primary Ripple Current
IRMS 1.31 Amps Primary RMS Current
TRANSFORMER PRIMARY DESIGN
PARAMETERS
LP 273 uHenries Primary Inductance
NP 18 Primary Winding Number of Turns
NB 2 Bias Winding Number of Turns
ALG 834 nH/T^2 Gapped Core Effective Inductance
BM 2934 Gauss Maximum Flux Density at PO, VMIN (BM<3000)
BP 4140 Gauss Peak Flux Density (BP<4200)
BAC 880 Gauss AC Flux Density for Core Loss Curves (0.5 X Peak to Peak)
ur 191 Relative Permeability of Ungapped Core
LG 0.16 mm Gap Length (Lg > 0.1 mm)
BWE 12.88 mm Effective Bobbin Width
OD
0.71 mm Maximum Primary Wire Diameter including insulation
INS 0.07 mm Estimated Total Insulation Thickness (= 2 * film thickness)
DIA 0.64 mm Bare conductor diameter
AWG 23 AWG Primary WireGauge (Rounded to next smaller standard AWG value)
CM 512 Cmils Bare conductor effective area in circular mils
CMA 390
Cmils/Am
p
Primary Winding Current Capacity (200 < CMA < 500)
TRANSFORMER SECONDARY DESIGN
PARAMETERS (SINGLE OUTPUT / SINGLE
OUTPUT EQUIVALENT)
Lumped parameters
ISP 13.96 Amps Peak Secondary Current
ISRMS 6.22 Amps Secondary RMS Current
IO 3.65 Amps Power Supply Output Current
IRIPPLE 5.05 Amps Output Capacitor RMS Ripple Current
CMS 1245 Cmils Secondary Bare Conductor minimum circular mils
AWGS 19 AWG
Secondary WireGauge (Rounded up to next larger standard AWG
value)
DIAS 0.91 mm Secondary Minimum Bare Conductor Diameter
ODS 3.07 mm
Secondary Maximum Outside Diameter for Triple Insulated
Wire
INSS 1.08 mm Maximum Secondary Insulation WallThickness
VOLTAGE STRESS
PARAMETERS
VDRAIN 647 Volts
Maximum Drain Voltage Estimate (Includes Effect
of Leakage Inductance)
PIVS 81 Volts Output Rectifier Maximum Peak Inverse Voltage
PIVB 52 Volts Bias Rectifier Maximum Peak Inverse Voltage
