FSFR1600XS Fairchild Semiconductor, FSFR1600XS Datasheet - Page 10

• Manufacturer Part Number: FSFR1600XS
• Description: IC FPS PWR SWITCH 160W 9-SIP
• Manufacturer: Fairchild Semiconductor
• Series: FPS™r

Specifications of FSFR1600XS

• Output Isolation: Isolated
• Frequency Range: 94kHz ~ 106kHz
• Voltage - Input: 9.6 V ~ 25 V
• Voltage - Output: 500V
• Power (watts): 160W
• Operating Temperature: -40°C ~ 130°C
• Package / Case: 9-SSIP
• Output Voltage: 500 V
• Output Power: 160 W
• Input Voltage: 9.6 V to 25 V
• Switching Frequency: 100 KHz
• Operating Temperature Range: - 40 C to + 130 C
• Mounting Style: Through Hole
• Duty Cycle (max): 50 %
• Number Of Outputs: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2010 Fairchild Semiconductor Corporation
FSFR-XS Series • Rev.1.0.1
It is typical to set the initial frequency of soft-start two to
three times the resonant frequency (f
network. The soft-start time is three to four times the RC
time constant. The RC time constant is:
4. Self Auto-Restart: The FSFR-XS series can restart
automatically even though any built-in protections are
triggered with external supply voltage. As can be seen in
Figure 20 and Figure 21, once any protections are
triggered, the M1 switch turns on and the V-I converter is
disabled. C
drops to V
off, and the V-I converter resumes at the same time. The
FSFR-XS starts switching again with soft-start. If the
protections occur while V
level, the switching is terminated immediately, V
continues to increase until reaching V
discharged by M1.
After protections trigger, FSFR-XS is disabled during the
stop-time, t
V
The soft-start time, t
t
τ
STOP
CssL
=
R
Figure 19. Frequency Sweeping of Soft-Start
. The stop-time of FSFR-XS can be estimated as:
SS
=
C
•
C
Figure 20. Internal Block of AR Pin
SS
CssL
SS
SS
stop
•
. Then, all protections are reset, M1 turns
{
, where V
starts to discharge until V
(
R
SS
s/s
+
R
can be set as Equation (4).
MIN
Css
Css
)
||
decreases and reaches to
5
is under V
k
Ω
}
O
) of the resonant
CssH
Css
CssL
, then C
across C
and V
SS
CssH
(4)
(5)
Css
SS
is
10
5. Protection Circuits: The FSFR-XS series has several
self-protective functions, such as Over-Current Protection
(OCP), Abnormal Over-Current Protection (AOCP), Over-
Voltage Protection (OVP), and Thermal Shutdown (TSD).
These protections are auto-restart mode protections, as
shown in Figure 22.
Once a fault condition is detected, switching is terminated
and the MOSFETs remain off. When LV
stop voltage of 10V or AR signal is HIGH, the protection is
reset. The FSFR-XS resumes normal operation when
LV
L V
5.1 Over-Current Protection (OCP): When the
sensing pin voltage drops below -0.58V, OCP is
triggered and the MOSFETs remain off. This protection
has a shutdown time delay of 1.5µs to prevent
premature shutdown during startup.
5.2 Abnormal Over-Current Protection (AOCP): If
the secondary rectifier diodes are shorted, large
current with extremely high di/dt can flow through the
MOSFET before OCP is triggered. AOCP is triggered
without shutdown delay if the sensing pin voltage
drops below -0.9V.
CC
V
CC
AR
I
Cr
reaches the start voltage of 12.5V.
Figure 21. Self Auto-Restart Operation
(a ) P r o te ction s a r e tr igge r e d, ( b ) F S F R- U S r e sta r ts
(a )
Figure 22. Protection Blocks
t
stop
(b )
t
S /S
( a )
(b )
CC
(a )
falls to the LV
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(b )
V
V
C ssH
C ssL
CC