# NCP1607 DWS

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```					                                          NCP1607 Design Spreadsheet
Rev. 1.0 - Skyler Covington Nov 2008
This spreadsheet helps designing a power supply using the NCP1607 (details of the equations are in the data sheet).
Please note that this is a general tool to assist designers in using the controller: the output is a guideline and does not guarantee the
success of a particular system design.

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Nominal Output Power            POUT =      100     W
Estimated Efficiency            η=         92     %
Lowest RMS Input Voltage          VacLL =       85     Vac               Line voltage used for the charts: Vline =         265      Vac
Highest RMS Input Voltage          VacHL =      265     Vac                    deg   v(t)  i(t)          t     freq Delta Vripple
ton (us)off (us) (kHz) V
VregH
fSW (kHz)0
4.90
Nominal Output Voltage           VOUT=       400      V                             0.0 0.00 1.24 ## 808 -7.95             -8.0
Maximum Output Voltage       VOUT(OVP) =      440      V    VregL 900   2.00 5      32.7 0.05 1.24 ## 742 -6.80            -14.8
Minimum Switching Frequency        fSW(MIN) =       50     kHz   Icharge      297 10     65.1 0.09 1.24 ## 676 -5.66            -20.4
800
Iovp          10 15     97.0 0.14 1.24 ## 612 -4.54            -25.0
RMS Input Current (maximum)                Iac =    1.28    A     Ics      700 0.5 20    128.2 0.18 1.24 ## 549 -3.45            -28.4
Peak Inductor Current (maximum)           IL(peak) =   3.62    A     Istartup      40 25    158.4 0.23 1.24 ## 488 -2.41            -30.8
RMS Inductor Current (maximum)            IL(RMS) =    1.48    A     Vcc(on) 600
13.00 30     187.4 0.27 1.24 ## 429 -1.40            -32.2
RMS Diode Current (maximum)            ID(RMS) =     0.75    A     ICL_NEG 2.50 35        215.0 0.31 1.24 ## 374 -0.45            -32.7
500
RMS MOSFET Current (maximum)              IM(RMS) =     1.27    A     VUVP        0.30 40    240.9 0.34 1.24 ## 321 0.43             -32.2
400      45   265.0 0.38 1.24 ## 273 1.25             -31.0
Maximum Calculated Inductor Value        L(MAX)_C =       408    mH    RFB         5.00 50    287.1 0.41 1.24 ## 228 2.00             -29.0
Used Inductor Value               L=       400    mH             300      55   307.0 0.44 1.24 ## 188 2.66             -26.3
Maximum On Time (VacLL)           ton(MAX) =     12.04    ms                     60   324.6 0.46 1.24 ## 152 3.24             -23.1
200
On Time at VacHL and full load TON          ton(HL) =     1.24    ms                     65   339.7 0.48 1.24 ## 122 3.73             -19.4
Frequency (peak VacLL, full load)    fSW(MIN)LL =     58.12   kHz            100      70   352.2 0.50 1.24 ##           97 4.12    -15.2
Frequency (peak VacHL, full load)     fSW(MIN)HL =      50.9   kHz                     75   362.0 0.52 1.24 ##           77 4.42    -10.8
0      80   369.1 0.53 1.24 ##           62 4.62     -6.2
0.0         265.0         374.8
Calculated Oscillator Ext. Capacitor         Ct_c =     1233    pF                      85   373.3 0.53 1.24 ##           54 265.0
4.73    -1.5 0.0
Selected Oscillator Ext. capacitor           Ct =     1800    pF                      90   374.8 0.53 1.24 Voltage (V) 4.73
Instantaneous Input ##      51           3.2
95   373.3 0.53 1.24 ##           54 4.62      7.9
Upper Feedback Resistor        ROUT1_C =       4000    kW      4000           100   369.1 0.53 1.24 ##           62 4.42     12.3
Selected Upper Feedback Resistor         ROUT1 =        4000    kW      4000           105   362.0 0.52 1.24 ##           77 4.12     16.4
Lower Feedback Resistor        ROUT2_C =       25.28   kW     25.28           110   352.2 0.50 1.24 ##           97 3.73     20.1
Selected Lower Feedback Resistor          ROUT2 =       25.28   kW     25.28           115   339.7 0.48 1.24 ## 122 3.24              23.4
Output Voltage which exits UVP      VOUT(UVP) =      47.76    V                     120   324.6 0.46 1.24 ## 152 2.66              26.0
Max. Current Sense Resistor for OCP      RSENSE_C =        0.14    W                     125   307.0 0.44 1.24 ## 188 2.00              28.0
Rcs Power Dissipation      PRSENSE_C =       0.22   W                      130   287.1 0.41 1.24 ## 228 1.25              29.3
135 265.0    0.38     1.24 ##     273 0.43         29.7
Selected Startup Resistor     RSTARTUP =      660            kW                     140 240.9    0.34     1.24 ##     321 -0.45        29.3
Selected Vcc Cap           CVCC =      47.0           uF                     145 215.0    0.31     1.24 ##     374 -1.40        27.9           Letter
Startup Time      tSTARTUP =      4.30            s                     150 187.4    0.27     1.24 ##     429 -2.41        25.5
155 158.4    0.23     1.24 ##     488 -3.45        22.0
Output Capacitor         CBULK =       180            mF                     160 128.2    0.18     1.24 ##     549 -4.54        17.5
AC Line Frequency            fline =      47            Hz                     165   97.0   0.14     1.24   ##   612   -5.66      11.8
Max. Low Freq Output ripple (pk-pk)       DVpk-pk =      4.70           V                      170   65.1   0.09     1.24   ##   676   -6.80       5.0
Max. Irms in Co (full load, low line)     IC(RMS) =     0.70           A                      175   32.7   0.05     1.24   ##   742   -7.95      -3.0
180    0.0   0.00     1.24   ##   808   -9.11     -12.1
Attenuation for 100 Hz ripple              G=        60            dB
Compensation Capacitor (Type 1)          CCOMP =       0.40           uF

Max Primary to Auxiliary Turns Ratio NB:NZCD_C =         11.0
Selected Turns Ratio     NB:NZCD =          10
Minimum value of Rzcd RZCD(MIN) =            15.0           kW

RSTARTUP = 660 kW

ID(RMS) = 0.75 A
IL(RMS) = 1.48 A        L = 400 mH

VOUT = 400 V
NZCD = 10
POUT = 100 W
RZCD >> 14.99 kW

IC(RMS) = 0.7 A
Iac = 1.28 A                                               ROUT1 = 4000 kW                    CVCC = 47 mF
NCP1607
CBULK = 180 mF

CCOMP = 0.4 mF                                       IM(RMS) = 1.27 A
VIN = 85 - 265 Vac

ROUT2 = 25.28 kW              Ct = 1800 pF
RSENSE = 0.138 W
PRSENSE = 0.22 W
Letter

```
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 views: 3 posted: 10/1/2012 language: English pages: 4