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FAN6861 Arkusz danych(PDF) 8 Page - Fairchild Semiconductor

Numer części FAN6861
Szczegółowy opis  a Flyback Power Supply with Peak Load Current Profile
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6861 Arkusz danych(HTML) 8 Page - Fairchild Semiconductor

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AN-6861
APPLICATION NOTE
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1 • 6/9/09
8
(Design Example)
510k
Ω resistor and 10μF capacitor
are selected for RSTART and CDD1, respectively.
Then, the current through the startup resistor for
minimum line voltage is:
3
2
1
()
2
2 90 17.5
1
()
62
2510 10
MIN
LINE
DD ON
RST
START
VV
I
R
A
π
μ
π
=−
=−
=
×
Then, the maximum startup time is obtained as
1
6
6
17.5
10 10
3.7 sec
(62 15) 10
MAX
DD ON
START
DD
MAX
RST
DD ST
V
TC
II
=
=
−×
The maximum power dissipation of RSTART is:
2
2
3
()
265
68
2
2 510 10
MAX
LINE
RST
START
V
P
mW
R
≅=
=
⋅×
Leading-Edge Blanking (LEB)
Each time the power MOSFET is switched on, a turn-on
spike occurs across the sense resistor, caused by primary-
side capacitance and secondary-side rectifier reverse
recovery. To avoid premature termination of the switching
pulse, a leading-edge blanking time is built in. During this
blanking period (360ns), the PWM comparator is disabled
and cannot switch off the gate driver. Thus, an RC filter
with a small RC time constant is enough for current sensing
(e.g. 200
Ω + 470pF). A non-inductive resistor is
recommended for RCS.
Figure 11. Current sensing
Thermal Protection
Figure 12 shows the internal blocks for thermal protection.
A constant current, IRT, of 99μA is provided from the RT
pin. For over-temperature protection, an NTC thermistor in
series with a resistor can be connected between the RT and
GND pins. As temperature increases, the impedance of
NTC thermister decreases and RT pin voltage drops. When
the voltage of the RT pin is less than 1V longer than 17ms
(tDOTP-LATCH), OTP is triggered. When RT pin voltage is less
than 0.7V, OTP is triggered after the 100
μs debounce time.
If the thermal protection is not used, connect a small
capacitor (around 0.47nF is recommended) from the RT pin
to the GND pin to prevent noise interference. This RT
capacitor should not be larger than 1nF; otherwise, the
thermal protection is triggered before a successful build-up
of output voltage.
Figure 12. Thermal Protection Circuit


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