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LM3532 bảng dữ liệu(PDF) 42 Page - Texas Instruments

tên linh kiện LM3532
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LM3532 bảng dữ liệu(HTML) 42 Page - Texas Instruments

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SW
ILED1
GND
LM3532
Up to 40V
L
D1
Paracitic
Circuit Board
Inductances
Current through
inductor
Pulsed voltage at SW
Voltage Spike
LCD Display
SDA
SCL
IN
OVP
COUT
Current through
Schottky Diode and COUT
2.7V to 5.5V
10 k:
10 k:
Affected Node
due to capacitive
coupling
Cp1
Lp1
Lp2
Lp3
VLOGIC
IAVE = IIN
IPEAK
VOUT + VF Schottky
ILED2
ILED3
LM3532
SNVS653E – JULY 2011 – REVISED AUGUST 2015
www.ti.com
10 Layout
10.1 Layout Guidelines
The LM3532 contains an inductive boost converter which sees a high switched voltage (up to 40 V) at the SW
pin, and a step current (up to 1 A) through the Schottky diode and output capacitor each switching cycle. The
high switching voltage can create interference into nearby nodes due to electric field coupling (I = CdV/dt). The
large step current through the diode, and the output capacitor can cause a large voltage spike at the SW pin and
the OVP pin due to parasitic inductance in the step current conducting path (V = LdI/dt). Board layout guidelines
are geared towards minimizing this electric field coupling and conducted noise. Figure 44 highlights these two
noise generating components.
Figure 44. LM3532'S Boost Converter Showing Pulsed Voltage at SW (High Dv/Dt) and
Current Through Schottky and COUT (High Di/Dt)
42
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