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SM72445 Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce SM72445
Description  SM72445 Programmable Maximum Power Point Tracking Controller With Adjustable PWM Frequency
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

SM72445 Fiches technique(HTML) 9 Page - Texas Instruments

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SM72445
www.ti.com
SNVS795 – MARCH 2012
CONFIGURABLE SETTINGS
A/D pins A0, A2, A4, and A6 are used to configure the behavior of the SM72445 by adjusting the voltage applied
to them through resistor dividers as shown in Figure 2, where RT1 to RT4 should be in the range of 20 k
Ω.
The voltages of the configuration pins are read and the operating mode is then set at start-up and after each
reset of the device.
Three different frequencies for the PWM operation of the H-bridge as well as two different implementations of the
Panel Mode switch can be set on the ADC input channel 2 (pin A2). The table below lists the different conditions
that a user can select on pin A2. Each frequency has a different associated dead time for the operation of the
synchronous switches. When dedicated PM switch modes are used, the unit will stop switching the converter
upon entering PM mode and the PM_OUT pin will switch at a high frequency to provide activation of a dedicated
Panel Mode switch. When the H-bridge modes are used, the unit will keep the H-bridge switching at half the
operating frequency (to reduce switching losses) and with a total input to output ratio of 1. The dead times are
unchanged during this phase.
Table 1. Programmable Settings on Pin A2
A2
PWM Frequency setting
Panel Mode Operation
4.69 V
HIGH
Uses dedicated PM switch
4.06 V
HIGH
Uses dedicated PM switch
3.44 V
LOW
Uses H-bridge for PM operation
2.81 V
MED.
Uses H-bridge for PM operation
2.19 V
HIGH
Uses H-bridge for PM operation
1.56 V
LOW
Uses dedicated PM switch
0.94 V
MED.
Uses dedicated PM switch
0.31 V
HIGH
Uses dedicated PM switch
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. The slew rate limiter takes control of the duty cycle if the output voltage rises faster than the programmed limit
while the unit is running in Boost mode (output voltage higher than input voltage). The device will control the duty
cycle so that the output voltage stays within the allowed slew rate. The slew rate is never limited in Buck mode
(output voltage lower than input voltage).
Table 2. Programmable Settings on Pin A6
A6
Output Voltage
Starting Panel Mode
MPPT Exit
MPPT Start
Starting boost ratio
Slew Rate Limit
Time
Threshold (on
Threshold (on
AIOUT or AIIN)
AIOUT)
4.69 V
10V/1.2s
Not applicable
0 V
0 V
N/A
4.06 V
10V/1.2s
60s
0.006xVDDA
0.010xVDDA
1:1
3.44 V
10V/1.2s
0s
0.023xVDDA
0.039xVDDA
1:1
2.81 V
10V/1.2s
120s
0.023xVDDA
0.039xVDDA
1:1
2.19 V
10V/1.2s
Not applicable
0.006xVDDA
0.010xVDDA
1:1.2
1.56 V
10V/1.2s
60s
0.023xVDDA
0.039xVDDA
1:1
0.94 V
10V/0.6s
60s
0.023xVDDA
0.039xVDDA
1:1
0.31 V
No slew rate limit
60s
0.023xVDDA
0.039xVDDA
1:1
PARAMETER DEFINITIONS
Output Voltage Slew Rate Limit Settling Time: Time constant of the internal filter used to limit output voltage
change. At the fast slew rate, the output voltage will be held for 60 ms for every 1V increase, whereas in the slow
slew rate, the output voltage will be held for 120ms for every 1V increase. (See Figure 10).
Starting PM Time: After initial power-up or reset, the output soft-starts and then enters Panel Mode for this
amount of time.
Copyright © 2012, Texas Instruments Incorporated
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