LT1248 データシートの表示（PDF） - Linear Technology
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LT1248 Datasheet PDF : 12 Pages
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LT1248
TYPICAL APPLICATI
300W, 382V Preregulator
T
+
90V
EMI
TO
FILTER
270V
6A
–
750µH*
MURH860
IRF840
1M
1%
VOUT
+
180µF
0.047µF
RS
0.2Ω
20k
1%
20k
1M
4.7nF
50k
0.47µF
330k
RREF
4k
4k
100pF
0.1µF
1nF
20k
VCC +
16V TO 10V –
2.6V/2.2V –
10
+
EN/SYNC
11 VSENSE
6 IAC
8 OVP
7.5V
7.9V
12µA
5V
SS
13
VAOUT
7
9 VREF
7.5V
VREF
RUN
MOUT 5 4 ISENSE 3
CAOUT
PKLIM
2
–
+
2.2V
7µA
+
M1
–
–
EA
+
IA
IB
IM
=
IA2 IB
200µA2
IM
–
CA
+
–
+
32k
–
+
0.7V–
+
RUN
–
ONE SHOT
+
200ns
OSC
SYNC
VCC = 18V**
+
56µF
35V
1 GND
15 VCC
R
RQ
S
16V
GTDR
16
10Ω
1N5819
0.01µF
* 1. COILTRONICS CTX02-12236-1 (TYPE 52 CORE)
AIR MOVEMENT NEEDED AT POWER LEVEL GREATER THAN 250W.
2. COILTRONICS CTX02-12295 (MAGNETICS Kool Mµ® 77930 CORE)
** SEE START-UP AND SUPPLY VOLTAGE SECTION FOR VCC GENERATOR.
† THIS SCHOTTKY DIODE IS TO CLAMP GTDR WHEN MOS SWITCH
TURNS OFF. PARASITIC INDUCTANCE AND GATE CAPACITANCE MAY
TURN ON CHIP SUBSTRATE DIODE AND CAUSE ERRATIC OPERATIONS
IF GTDR IS NOT CLAMPED.
CSET
14
1000pF
RSET
12
15k
1248 TA01
Kool Mµ is a registered trademark of Magnetics, Inc.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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