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SM72442 датащи(PDF) 9 Page - Texas Instruments

номер детали SM72442
подробное описание детали  Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar Panels
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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SM72442 датащи(HTML) 9 Page - Texas Instruments

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SM72442
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SNVS689H – OCTOBER 2010 – REVISED APRIL 2013
Different conditions to enter and exit Panel Mode can be set on the ADC input channel 2. Listed below are
different conditions that a user can select on pin A2. “1:1” refers to the state in which the DC/DC converter
operates with its output voltage equal to its input voltage (also referred to as “Buck-Boost” mode in Figure 4.)
A2
Entering Panel Mode
Exiting Panel Mode
4.69 V
2s in 1:1 Mode
3.1% power variation
4.06 V
1s in 1:1 Mode
3.1% power variation
3.44 V
0.4s in 1:1 Mode
3.1% power variation
2.81 V
0.2s in 1:1 Mode
3.1% power variation
2.19 V
2s in 1:1 Mode
1.6% power variation
1.56 V
1s in 1:1 Mode
1.6% power variation
0.94 V
0.4s in 1:1 Mode
1.6% power variation
0.31 V
0.2s in 1:1 Mode
1.6% power variation
The user can also select the output voltage slew rate, minimum current threshold and duration of Panel Mode
after the soft-start period has finished, by changing the voltage level on pin A6 which is the input of ADC channel
6.
A6
Output Voltage
Starting Panel Mode
MPPT Exit
MPPT Start
Starting boost ratio
Slew Rate Limit
Time
Threshold
Threshold
4.69 V
Slow
Not applicable
0 mA
0 mA
1:1
4.06 V
Slow
60s
75mA
125mA
1:1
3.44 V
Slow
0s
300mA
500mA
1:1
2.81 V
Slow
120s
300mA
500mA
1:1
2.19 V
Slow
Not applicable
300mA
500mA
1:1.2
1.56 V
Slow
60s
300mA
500mA
1:1
0.94 V
Fast
60s
300mA
500mA
1:1
0.31 V
No slew rate limit
60s
300mA
500mA
1:1
PARAMETER DEFINITIONS
Output Voltage Slew Rate Limit Settling Time: Time constant of the internal filter used to limit output voltage
change. For fast slew rate, every 1V increase, the output voltage will be held for 30 ms whereas in a slow slew
rate, the output voltage will be held for 62 ms for every 1V increase. (See Figure 6).
Starting PM Time: After initial power-up or reset, the output soft-starts and then enters Panel Mode for this
amount of time.
MPPT Exit Threshold and MPPT Start Threshold: These are the hysteretic thresholds for Iout_th.
Starting Boost Ratio – This is the end-point of the soft-start voltage ramp. 1:1 ratio means it stops when Vout =
Vin, 1:1.2 means it stops when Vout = 1.2 x Vin.
PANEL MODE PIN (PM) PIN
The SM72442 can be forced into Panel Mode by pulling the PM pin low. One sample application is to connect
this pin to the output of an external temperature sensor; therefore whenever an over-temperature condition is
detected the chip will enter a Panel Mode.
Once Panel Mode is enabled either when buck-boost mode is entered for a certain period of time (adjustable on
channel 2 of ADC) or when PM is pulled low, the PM_OUT pin will output a 400 kHz square wave signal. Using a
gate driver and transformer, this square wave signal can then be used to drive a Panel Mode FET as shown in
Figure 7.
Copyright © 2010–2013, Texas Instruments Incorporated
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