LT3758 LINER [Linear Technology], LT3758 Datasheet - Page 26

• Manufacturer Part Number: LT3758
• Description: High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
• Manufacturer: LINER [Linear Technology]

LT3758
APPLICATIONS INFORMATION
Check the stress on the power MOSFET by measuring its
drain-to-source voltage directly across the device terminals
(reference the ground of a single scope probe directly to
the source pad on the PC board). Beware of inductive
ringing, which can exceed the maximum specifi ed voltage
rating of the MOSFET. If this ringing cannot be avoided,
and exceeds the maximum rating of the device, either
choose a higher voltage device or specify an avalanche-
rated power MOSFET.
The small-signal components should be placed away from
high frequency switching nodes. For optimum load regula-
26
VIAS TO GROUND
PLANE
C
C
R1
R2
C
R
C1
C2
SS
T
R
C
1
2
3
4
5
Figure 11. Suggested Layout of the 10V to 40V Input, 48V Output
Boost Converter in the Typical Applications Section
LT3758
10
9
8
7
6
C
C
OUT2
IN
R3
C
R
VCC
S
1
2
3
4
C
OUT1
tion and true remote sensing, the top of the output voltage
sensing resistor divider should connect independently to
the top of the output capacitor (Kelvin connection), staying
away from any high dV/dt traces. Place the divider resis-
tors near the LT3758 in order to keep the high impedance
FBX node short.
Figure 11 shows the suggested layout of the 10V to 40V
input, 48V output boost converter in the Typical Applica-
tions section.
M1
8
7
6
5
D1
L1
3758 F11
V
V
IN
OUT
3758f