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LT1508I Datasheet

  • LT1508I

  • Linear Technology [Power Factor and PWM Controller(Voltage ...

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LT1508
APPLICATIONS INFORMATION
An LT1431 reference/amplifier coupled to a low cost
optoisolator closes the loop from secondary side to pri-
mary side. Efficiency versus power and line voltage is
shown in Figure 10. The PFC preregulator alone has
efficiency numbers between 90% and 97% over line and
load.
A 3-turn secondary added to the 70-turn primary of T1
bootstraps V
CC
to about 15V supplying the chip鈥檚 13mA
requirement as well as about 39mA to cover the gate
current of the three FETs and high side transformer. A
0.15鈩?sense resistor is used to sense input current and
servo to the command created by the outer voltage and
multiplier. Thus the input current follows the input line
voltage, and changes as necessary, in order to maintain
constant bank voltage. The forward converter sees a
voltage input of 382VDC unless the line voltage drops out,
in which case the 330碌F main capacitor discharges to
240VDC before the PWM stage is shut down. Compared to
a typical off-line converter, the effective input voltage
range of the forward converter is much smaller, simplify-
ing the design. Additionally, the higher bus voltage pro-
vides greater hold-up times for given capacitor size.
90
200W/300W
85
100W
80
EFFICIENCY (%)
75
30W
70
90
14
U
W
U
U
132
180
V
RMS
250
1508 鈥?F1O
Figure 10

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