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AP3708NMTR-G1 Datasheet(PDF) 8 Page - BCD Semiconductor Manufacturing Limited

Part # AP3708NMTR-G1
Description  PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
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Manufacturer  BCDSEMI [BCD Semiconductor Manufacturing Limited]
Direct Link  http://www.bcdsemi.com
Logo BCDSEMI - BCD Semiconductor Manufacturing Limited

AP3708NMTR-G1 Datasheet(HTML) 8 Page - BCD Semiconductor Manufacturing Limited

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PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
AP3708N
Preliminary Datasheet
8
BCD Semiconductor Manufacturing Limited
Apr. 2009 Rev. 2. 1
Operation Description
Figure 10 illustrates a simplified flyback converter
controlled by AP3708N.
Constant Primary Peak Current
The primary current ip(t) is sensed by a current sense
resistor RCS as shown in Figure 10.
The current rises up linearly at a rate of:
As illustrated in Figure 11, when the current ip(t) rises
up to Ipk, the switch Q1 turns off. The constant peak
current is given by:
The energy stored in the magnetizing inductance LM
each cycle is therefore:
So the power transferring from the input to the output
is given by:
where fSW is the switching frequency. When the peak
current Ipk is constant, the output power depends on
the switching frequency fSW.
Constant Voltage Operation
The AP3708N captures the auxiliary winding
feedback voltage at FB pin and operates in constant-
voltage (CV) mode to regulate the output voltage.
Assuming the secondary winding is master, the
auxiliary winding is slave during the D1 on-time. The
auxiliary voltage is given by:
Figure 10. Simplified Flyback Converter Controlled by AP3708N
M
L
t
vg
dt
t
dip
)
(
)
( =
......(1)
Ip
0A
See equation 2
Figure 11. Primary Current Waveform
Rcs
Vcs
Ipk
=
......(2)
2
2
1
Ipk
L
Eg
M ×
×
=
SW
M
f
Ipk
L
P
×
×
×
=
2
2
1
......(4)
()
Vd
Vo
N
N
V
S
AUX
AUX
+
×
=
......(5)
......(3)
+
C1
+
Co
V
O
D1
Rcs
Q1
OUT
FB
CS
GND
AP3708N
Ns
N
AUX
Np
Io
Vs
V
AUX
Ip
v
in
L
M
CMP
C2


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