SM72442MTX/NOPB National Semiconductor, SM72442MTX/NOPB Datasheet - Page 6

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SM72442MTX/NOPB

Manufacturer Part Number
SM72442MTX/NOPB
Description
PV DMPPT Controller - Solar
Manufacturer
National Semiconductor
Series
SolarMagic™r
Datasheet

Specifications of SM72442MTX/NOPB

Applications
Controller, Photovoltaic Solar Panels
Voltage - Input
4.75 V ~ 5.25 V
Number Of Outputs
1
Voltage - Output
-
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
28-TSSOP (0.173", 4.40mm Width)
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Operation Description
OVERVIEW
The SM72442 is a programmable MPPT controller capable of
outputting four PWM gate drive signals for a 4-switch buck-
boost converter with an independent Panel Mode. The typical
application circuit is shown in
The SM72442 uses an advanced digital controller to generate
its PWM signals. A maximum power point tracking (MPPT)
algorithm monitors the input current and voltage and controls
the PWM duty cycle to maximize energy harvested from the
Figure
2.
FIGURE 4. High Level State Diagram for Startup
6
photovoltaic module. MPPT performance is very fast. Con-
vergence to the maximum power point of the module typically
occurs within 0.01s. This enables the controller to maintain
optimum performance under fast-changing irradiance condi-
tions.
Transitions between buck, boost, and Panel Mode are
smoothed and advanced digital PWM dithering techniques
are employed to increase effective PWM resolution. Output
voltage and current limiting functionality are integrated into
the digital control logic. The controller is capable of handling
both shorted and no-load conditions and will recover smoothly
from both conditions.
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