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LTC3900 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC3900
Description  Synchronous Rectifier Driver for Forward Converters
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3900 Datasheet(HTML) 11 Page - Linear Technology

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LTC3900
11
3900i
APPLICATIO S I FOR ATIO
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)
× 45°
0
°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1
2
3
4
.150 – .157
(3.810 – 3.988)
NOTE 3
8
7
6
5
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN
.160
±.005
RECOMMENDED SOLDER PAD LAYOUT
.045
±.005
.050 BSC
.030
±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE
MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS
SHALL NOT EXCEED .006" (0.15mm)
quickly. The VCC supply circuit shown in Figure 9 will
provide power for the LTC3900 within the first few switch-
ing pulses of the primary controller, preventing overheat-
ing of the MOSFETs.
MOSFET Selection
The required MOSFET RDS(ON) should be determined
based on allowable power dissipation and maximum re-
quired output current.
The body diodes conduct during the power-up phase,
when the LTC3900 VCC supply is ramping up. The CG and
FG signals stay low and the inductor current flows through
the body diodes. The body diodes must be able to handle
the load current during start-up until VCC reaches 4.1V.
The LTC3900 drivers dissipate power when switching
MOSFETs. The power dissipation increases with switch-
ing frequency, VCC and size of the MOSFETs. To calculate
the driver dissipation, the total gate charge QG is used.
This parameter is found on the MOSFET manufacturers
data sheet.
The power dissipated in each LTC3900 MOSFET driver is:
PDRIVER = QG • VCC • fSW
where fSW is the switching frequency of the converter.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC3900 for your layout:
1. Connect the 4.7
µFbypasscapacitorascloseaspossible
to the VCC and GND pins.
2. Connect the two MOSFET drain terminals directly to the
transformer. The two MOSFET sources should be as close
together as possible.
3. Keep the timer, SYNC and VCC regulator circuit away
from the high current path of Q3, Q4 and T1.
4. Place the timer capacitor, CTMR as close as possible to
the LTC3900.
5. Keep the PCB trace from the resistors RCS1, RCS2 and
RCS3 to the LTC3900 CS+/CSpins as short as possible.
Connect the other ends of the resistors directly to the drain
and source of the MOSFET, Q4.


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