EPR-12 Datasheet, PDF (28/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-12 - 145 W PC Forward Converter with TOP247 and 10 W 5 V Output Standby Flyback with TNY266

EPR-12 – PC Forward Converter with Standby Flyback Power Supply
01-Feb-05
UNDER-VOLTAGE LOCKOUT CIRCUIT
PARAMETERS
VACUVL
VACUV
VACUVX
RUVA
RUVB
RUVC
VACUVL ACTUAL
VACUVX ACTUAL
DUTY CYCLE LIMIT CIRCUIT PARAMETERS
VZ
VOV
RA
RB
RC
RD
CVS
DUTY CYCLE PARAMETERS (see
graph)
DMAX ACTUAL
DMAX RESET
DXDO MIN
DXDO MAX
DLL ACTUAL
DXLL MIN
DXLL MAX
DLL RESET
DHL ACTUAL
DXHL MIN
DXHL MAX
DHL RESET
Caution
voltage
68 AC volts
78 AC volts
68
2.23 MOhm
523.73 kOhm
75.91 kOhm
67.50 AC volts
70.36 AC volts
AC undervoltage lockout voltage; On-Off
transition
AC undervoltage lockout voltage; Off-On
transition
Resistor RUVA value
Resistor RUVB value
Resistor RUVC value
Actual AC undervoltage lockout voltage; On-
Off transition
Actual AC undervoltage lockout voltage; Off-
On transition
6.80 Volts
380 Volts
2.20 MOhm
2.20 MOhm
40.26 kOhm
126.70 kOhm
92.98 pF
0.69
0.79
0.70
0.79
0.47
0.55
0.67
0.69
0.23
0.24
0.35
0.36
Zener voltage used within DLIM circuit
Approximate frequency reduction voltage
(determines CVS value)
Resistor RA value
Resistor RB value
Resistor RC value
Resistor RD value
Capacitor CVS value
Dropout Duty-Cycle Parameters
Operating Duty cycle at DC Bus dropout
voltage
Transformer Reset Minimum duty cycle at
DC Bus dropout voltage
Device Min Duty cycle limit at DC Bus
dropout voltage
!!! >DMASRESET from VMIN to
VDROPOUT. NOT hazardous
Duty cycle at minimum DC Bus voltage
Duty cycle minimum limit at minimum DC
Bus voltage
Duty cycle maximum limit at minimum DC
Bus voltage
Minimum duty cycle to reset transformer at
low line
High Line Duty-Cycle Parameters
Duty cycle at minimum DC Bus voltage
Duty cycle minimum limit at maximum DC
Bus voltage
Duty cycle maximum limit at maximum DC
Bus voltage
Minimum duty cycle to reset transformer at
high line
Power Integrations
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