Preliminary
KA5Q1265RT
S P S
The SPS product family is specially designed for an off-line SMPS
with minimal external components. The SPS consist of high voltage
power SenseFET and current mode PWM IC.
Included PWM controller features integrated fixed oscillator, under
voltage lock out, leading edge blanking, optimized gate turn-on/turn-
off driver, thermal shut down protection, over voltage protection, and
temperature compensated precision current sources for loop
compensation and fault protection circuitry. Compared to discrete
MOSFET and controller or RCC switching converter solution, a SPS
can reduce total component count, design size, and weight and at
the same time increase efficiency, productivity, and system reliability.
It has a basic platform well suited for cost-effective design in Quasi-
Resonant Converter as C-TV power supply.
TO -22 0F -5L
S P S
1. Drain 2. GND 3. V
CC
4. FB 5. Sync
FEATURES
鈥?/div>
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Quasi Resonant Converter Controller
Internal Burst mode Controller for Stand-by mode
Pulse by pulse current limiting
Over current Latch protection
Over voltage protection (Vsync: Min. 11V)
Internal thermal shutdown function
Under voltage lockout
Internal high voltage sense FET
Auto-restart mode
ORDERING INFORMATION
Device
KA5Q1265RT
Package
TO-220F-5L
Topr (擄C)
擄
鈭?5擄C
to +85擄C
BLOCK DIAGRAM
+
鈥?/div>
Sync.
REF.
PSR
REF.
Burst mode
controller
Internal
Bias
Vref
鈥?/div>
+
UVLO
3
1
鈥?/div>
+
5
OSC
S
R
_
Q
Ron
OVP
LEB
Roff
PWM
4
1.7R
Ifb
R
鈥?/div>
+
Vfb offset
Ids
+
Vds
REF.
鈥?/div>
S
TSD
150
o
C
Power-on
Reset
Q
R
Delay
500nS
+
鈥?/div>
OCL
REF.
Vz
Rsense
2
REV. B
錚?/div>
1999 Fairchild Semiconductor Corporation
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英文版
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