The SolarMagic™ SM72442 MPPT digital controller and SM72295 photovoltaic full bridge drivers are designed to control high efficiency DC/DC conversion used in photovoltaic applications. This application note will detail the usage of those devices in a battery charging application.
The RD-189 reference design is meant to provide support for a wide variety of implementations, however, unless otherwise noted, this reference design system is shown charging a 12V commercial automotive lead acid battery.
If the battery voltage is very low, a slow charge current is applied and limited until the voltage rises above a pre-set threshold value Vt. The full charge current is then applied. Once full charge is detected on the voltage of the battery, the system switches to a floating charge and maintains the battery voltage at a fixed threshold. At any time, the system will run in MPPT mode if the available power is lower than the power required to achieve voltage or current regulation.
12V Lead Acid Battery
Vin range = 15V to 45V Vmp (50V Voc)
Max Input Current: Isc = 11A
MPPT algorithm for optimized photovoltaic applications
Up to 9A charging current
Reverse current protection
Trickle charge and fast charge mode
Up to 98% converter efficiency
14.2V max charge voltage, 13.5V floating voltage
Output voltage set-points can be re programmed
Manufacturer | Texas Instruments |
---|---|
Category | Power Management |
Sub-Category | Battery Chargers |
Eval Board Part Number | SM3320-BATT-EV/NOPB-ND |
Eval Board Supplier | Texas Instruments |
Eval Board |
Normally In Stock
|
Cell Type |
Lead Acid
|
Configuration |
1 Cell
|
Voltage In |
15 ~ 45 V
|
Voltage Out |
14.2 V (13.5 V Float)
|
Current Out |
9 A
|
Features |
Reverse Polarity Protection
|
Quiescent Current [Typical] |
- Not Given
|
Sleep Mode Current [Typical] |
- Not Given
|
Component Count + Extras |
184 + 12
|
Application / Target Market |
Solar Powered Back-up
|
Design Author |
Texas Instruments
|
Main I.C. Base Part |
SM72295
SM72442 |
Quiescent Current [Maximum] | |
Sleep Mode Current [Maximum] | |
Date Created By Author | |
Date Added To Library | 2024-07 |