MAX17499 Maxim Integrated Products, MAX17499 Datasheet - Page 15

• Manufacturer Part Number: MAX17499
• Description: (MAX17499 / MAX17500) Current-Mode PWM Controllers
• Manufacturer: Maxim Integrated Products

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Figure 8 shows the 12V to 15V output boost regulator.
Typically, there are two sources of noise emission in a
switching power supply: high di/dt loops and high
dV/dt surfaces. For example, traces that carry the drain
current often form high di/dt loops. Similarly, the
heatsink of the MOSFET presents a dV/dt source; there-
fore, minimize the surface area of the heatsink as much
as possible. Keep all PCB traces carrying switching
Figure 8. 12V to 15V Output Boost Regulator
______________________________________________________________________________________
0V
12V
C1
Layout Recommendations
C2
Programmable Switching Frequency
Current-Mode PWM Controllers with
C3
IN
V
COMP
FB
UFLG
CC
R12
MAX17499
RT
C6
UVLO/EN
R15
NDRV
GND
CS
currents as short as possible to minimize current loops.
Use a ground plane for best results. The pins of the
μMAX package are positioned to allow easy interfacing
to the external MOSFET.
For universal AC input design, follow all applicable
safety regulations. Offline power supplies may require
UL, VDE, and other similar agency approvals. To avoid
noise coupling of signals from RT to NDRV, route traces
from RT away from NDRV.
R3
R2
L1
Q1
R1
D1
C4
R5
R6
15V
15
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