ltc3900 Linear Technology Corporation, ltc3900 Datasheet - Page 11

• Manufacturer Part Number: ltc3900
• Description: Synchronous Rectifier Driver For Forward Converters
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
PACKAGE DESCRIPTIO
0.22µF
0.1µF
.030 ±.005
115k
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE
2.2k
MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS
SHALL NOT EXCEED .006" (0.15mm)
59k
TYP
13.2k
.245
MIN
27k
RECOMMENDED SOLDER PAD LAYOUT
22k
10k
33k
U
370k
.050 BSC
L1: PA0713, PULSE ENGINEERING
ALL CAPACITORS X7R, CERAMIC, TDK
(MILLIMETERS)
7
3
9
5
6
1
2
SD_V
R
BLANK
SS_MAXDC
V
COMP
FB = 1.23V
INCHES
R
OSC
= 2.5V
36V TO 72V
U
SEC
LT1952
Figure 10. 36V to 72V, 3.3V at 40A Synchronous Forward Converter
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.
+V
IN
.045 ±.005
.160 ±.005
W
DELAY
I
PGND
SENSE
SOUT
GND
OUT
V
8-Lead Plastic Small Outline (Narrow .150 Inch)
(0.203 – 0.254)
47k
82k
OC
U
IN
.008 – .010
14
15
8
13
12
11
10
16
V
B1
18V
(0.254 – 0.508)
(Reference LTC DWG # 05-08-1610)
.010 – .020
BAT760
U
470Ω
39k
BCX55
12V
(0.406 – 1.270)
.016 – .050
V
B1
× 45°
S8 Package
1nF
220pF
BAS516
Si7846
2.2µF
0.1µF
0.010R
PA0912.002
0°– 8° TYP
•
•
•
1nF
V
Q4470-B
33nF
B1
C13
C14
1µF
1µF
• •
(5.791 – 6.197)
8V BIAS
.228 – .244
BIAS
8V
Q2
PH3230
2x
(1.346 – 1.752)
(0.355 – 0.483)
.053 – .069
.014 – .019
560R
5
6
4
8
1
2
3
TYP
FG
GND
V
SYNC
V
GND
OC
CC
IN
LTC3900
LT4430
PH3230
R22
270Ω
8
1
NEC
PS2701
TIMER
COMP
OPTO
CS
CS
Q3
(4.801 – 5.004)
2x
CG
FB
.189 – .197
+
–
7
2
15k
NOTE 3
3
1
2
7
6
5
4
BIAS
8V
6
3
1nF
L1
10k
10k
10k
5
4
3.3k
R23
(1.270)
10pF
.050
C16
BSC
(3.810 – 3.988)
(0.101 – 0.254)
6.8nF
.150 – .157
C15
.004 – .010
C
100µF
3x
3900 F10
NOTE 3
LTC3900
OUT
SO8 0303
R24
27.4k
1%
R25
6.04k
1%
V
3.3V, 40A
OUT
11
3900f