User Manual

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Simple-H User Manual

Thank you for your purchase of the Robot Power Simple-H. This manual explains the

features and functions of the Simple-H along with some tips for successful application. Before

using your Simple-H you must read and agree to the disclaimer printed at the end of this

document.

The Robot Power Simple-H is a low-cost easy to connect general-purpose power amplifier

that can be configured as a single H-bridge circuit or as two independent half-bridge circuits.

While designed for permanent magnet brushed DC motors; the Simple-H is suitable for a wide

range of DC loads as long as they are within the current and voltage envelope of the device.

1. Specifications

Without Fan With Fan

Voltage Range 5V – 24V (28V absolute max) Same

Current (H-

bridge)

20A cont. at 100% duty cycle

17A cont. at 70%

45A 5 second peak

25A cont. at 100%

20A at 70%

45A 5 second peak

Current (each half-

bridge)*

Same as above Same as above

Current (ganged

half-bridge)*

40A cont. at 100%

35A cont. at 70%

70A 5 second peak

48A cont. at 100%

38A cont. at 70%

70A 5 second peak

PWM frequency DC – 20kHz DC-20kHz

Current Sense

Output

Vc = I * 0.075

Vc = .0.75 at 10A

Vc = 2.99V at 40A

Same

Input voltage

levels

PA,PB,EA,EB

2.5V – 5.5V = logic high

<1.7V = logic low

Same

Size 2.5” x 2.25” x 0.5” 2.5” x 2.25” x 0.75”

Weight 37g 61g

Mounting 4x - 4-40 or M2.5 bolts Same

Fan None 50mm x 10mm – 12V

Summary of content (8 pages)

PAGE 1
Simple-H User Manual Thank you for your purchase of the Robot Power Simple-H. This manual explains the features and functions of the Simple-H along with some tips for successful application. Before using your Simple-H you must read and agree to the disclaimer printed at the end of this document. The Robot Power Simple-H is a low-cost easy to connect general-purpose power amplifier that can be configured as a single H-bridge circuit or as two independent half-bridge circuits.
PAGE 2
1. Your actual current capacity will vary based on the type of load, the length and size of wires, power supply capability and other factors. 2. Input Output connections and Jumper Settings J1 Jumper Connections The Simple-H ships with two jumpers used to select the enable and current sense options of the unit. By default these are installed on EA and CA for combined enable and current sense operation (see below).
PAGE 3
. Application Configurations J1 EA J1 CA PA PB EA CA EB CB On On PWM Fwd PWM Rev Enable Current Sense N/C N/C J1 EAB J1 CAB PA PB EA CA EB CB On On PWM Motor 1 PWM Motor 2 Enable Mot 1 Current Mot 1 Enable Mot 2 Current Mot 2 J1 EA J1 CAB PA PB EA CA EB CB On On PWM M1 Tie to PA Enable Current A* N/C N/C * The current reading will only be for the current passing through the M1 power chip, which is ½ of the total.
PAGE 4
Both half-bridges may operate independently or they can be ganged together in parallel to support approximately double the current of the H-bridge or single half-bridge configuration. When driving DC motors it is important to understand the power switch configuration within the BTS7960B chip. As long as the enable line (EA or EB) is held logic high, the motor terminal (M1 or M2) is connected either to the B+ or B- terminal through the device.
PAGE 5
It is recommended that you drive the load using the sign-magnitude method for H-bridge applications. This method allows the excess current to recirculate in the motor windings and reduces current feeding back into the power supply. If locked-antiphase drive is desired be aware that the power dissipation will increase especially in the main filter capacitor. This should be monitored carefully by measuring the temperature of the filter capacitor to make sure it is not getting hot when driving the load.
PAGE 6
5. If the Simple-H is coated with conformal PCB coating products please ensure the heatsinks are masked and left free of coating. 6. Monitor the terminal connectors especially if fork type terminals are used. It is possible for them to twist and come in contact with the filter capacitor. If the filter cap is too close to the B+ and B- terminals it may be gently pushed back toward the heatsinks.
PAGE 7
. Dimensions and Mounting 8. Schematic The Simple-H schematic may be downloaded from the Robot Power Web site. www.robotpower.com/downloads/ 9. Further questions For questions not answered by this document or for application advice please feel free to contact us. We’ll be happy to answer your questions and hopefully together we can make your project using the Simple-H a big success.
PAGE 8
You can contact us at the following address: Robot Power 31808 8th Ave. S. Roy, WA 98580 USA 253-843-2504 support@robotpower.com Thanks again for purchasing the Simple-H and best of luck with your projects. The Robot Power Team Disclaimer: The Simple-H is intended for educational and experimental uses. It should not be used in applications where human life or health or significant property value depend on its proper operation.