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NCP1653, NCP1653A
APPENDIX I – SUMMAR Y OF EQUATIONS IN NCP1653 BOOST PFC
Description
Follower Boost Mode
Constant Output Voltage Mode
+ 1
Boost Converter
Vout
Vin
t ) t2
t2
+
T
T * t1
Same as Follower Boost Mode
3 Vout * Vin + t
+ 1
t1
Vout 1 ) t2
t
T
Input Current Averaged by
Filter Capacitor
Nominal Output Voltage (I FB
= 200 m A)
Feedback Pin Voltage V FB1
Output Voltage
Inductor Current
Peak ? Peak Ripple
Iin + IL * 50
Vout(nom) + IFBRFB ) VFB1
[ IFBRFB + 200 m A @ RFB
Please refer to Figure 11.
Vin t Vout t 192 m A @ RFB
D IL(pk * pk) t 2 @ IL * 50
Same as Follower Boost Mode
Same as Follower Boost Mode
Same as Follower Boost Mode
192 m A @ RFB t Vout t 200 m A @ RFB
Same as Follower Boost Mode
Icontrol + Icontrol(max) + ref + 100 m A
Control Current
I
2
Icontrol +
Icontrol(max)
0.04
1 *
Vout
RFBIref
and Icontrol t Icontrol(max) + 100 m A
Switching Frequency
f + 67 or 100 kHz
Same as Follower Boost Mode
L u L(CRM) + out
Minimum Inductor for CCM
V * Vin
Vout
Vin 1
D IL(pk * pk) f
Same as Follower Boost Mode
Zin + M CS ac out
Input Impedance
R R V V
RSR vacIrefVref
Zin +
RM RCS Vac Vout
2RS R vac Icontrol Vref
Input Power
Pin +
RS R vac Iref Vref Vac
RM RCS Vout
Pin +
2RSR vacVref IcontrolVac
RMRCS Vout
Output Power
Pout + h Pin +
h RS R vac Iref Vref Vac
RM RCS Vout
Pout +
h 2 RS R vac Vref Icontrol Vac
RM RCS Vout
Maximum Input Power when
I control = 100 m A
Pin(max) + Pin +
RS R vac Iref Vref Vac
RM RCS Vout
Circuit will enter follower boost region when
maximum power is reached.
Current Limit
IL(OCP) +
RS
RCS
@ 200 m A
Same as Follower Boost Mode
Power Limit
IL @ VAC t
RS Rvac ) 12 k W
RCS 2
@ 3 nA2
Same as Follower Boost Mode
Output Overvoltage
Output Undervoltage
Vout(OVP) + 107% @ Vout(nom)
[ 214 m A @ RFB
Vout(UVP * on) + 8% @ Vout(nom)
[ 16 m A @ RFB
Vout(UVP * off) + 12% @ Vout(nom)
[ 24 m A @ RFB
Same as Follower Boost Mode
Same as Follower Boost Mode
Input Voltage Sense Pin
Resistor R vac
PWM Comparator
Reference Voltage
Rvac u 938 k W and R vac +
Vref + 2.62 V
Rvac ) 12 k W
2
Same as Follower Boost Mode
Same as Follower Boost Mode
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