User Manual

Version 1.5 - December 11, 2010
7
Figure 6. MegaMoto ganged half-bridge mode
Function Jumper Notes
Enable D13 Pin D13 is used to enable the MegaMoto
PWMA D11 Timer2 PWM2A
PWMB Jumper to D11 both the A-side and B-side chips must be
driven from the same signal source or there
will be a momentary short from chip to chip
when they switch at slightly different times.
Current Sense A1 Current monitoring is done on only the B-
side chip. So the current read is ½ of the
total current. Either A or B-side current can
be monitored.
Ganged half-bridge mode is used for a larger uni-directional load. This mode is slightly tricky
to use because the power section of the power chips are joined together. If the chips switch
at different times there will be a short condition from chip to chip potentially destroying them.
Thus, a single PWM source must be used for both chips. This cannot be done with jumper
blocks but must be done with wire jumpers from between the PWM selection headers as
shown in Figure 6 above. It is possible to used three stacked MegaMoto units in ganged half-
bridge mode to drive a large brushless as each ganged MegaMoto acts like a single half-
bridge circuit.
4. Features
The MegaMoto uses the Infineon BTS7960B as its power-switching element. This chip
contains two low-resistance complimentary MOSFET switching elements along with protection
and driver circuits. Each BTS7960B thus contains a complete half-bridge and all needed
driver circuits including robust protection features. The device features self-protection from
over temperature, over current and over and under voltage conditions. As mentioned above
the two half-bridge chips may be connected either as an H-bridge or as two independent half-
bridges. This flexibility makes the MegaMoto suitable for driving a wide variety of DC loads.