STA6940M
STA6940M is Brushed DC Motor Driver manufactured by Sanken.
Features and Benefits
- Power supply voltage, VBB , 44 V maximum, 10 to 40 V normal operating range
- Logic supply voltage, VDD , 3 to 5.5 V patible
- Output current, IO ,4 A average, 8 A maximum
- Output elements are all N-channel MOSFETs to reduce losses
- Internal charge pump
- Forward, reverse, free, and brake control modes available
- Constant-current control:
▫ Off-time 35 μs, fixed (Slow Decay mode)
- Internal Overcurrent Protection (OCP) circuitry
▫ Off-time 142 μs fixed (Fast Decay mode)
- Internal Thermal Shutdown (TSD) circuitry
- ZIP type 18-pin fully-molded package (STA package)
Package: 18-pin ZIP (STA)
Description bining low-power CMOS-patible logic with highcurrent, high-voltage power MOSFET outputs, the STA6940M provides plete control and drive for brush DC motors. It provides internal fixed off time, pulse-width modulation (PWM) control of the output current, rated for 4 A normal operating level.
The CMOS logic section provides four modes of operation: forward and reverse normal drive rotation, outputs-off free spin (coast), and electronic braking.
The innovative multi-chip internal structure separates the main logic IC (MIC) from the four N-channel power MOSFETs. This results in lower thermal resistance and greater efficiency.
PWM control allows constant-current control of output while reducing heat generation and power losses by providing fixed off-time dual decay modes. The internal charge pump ensures full power availability for switching.
Not to scale 28106.01
Functional Block Diagram
VDD 7
CP CP1 CP2 VBB VBB
14 13 12
18 1
5 IN1
6 IN2
11 Diag PWM_REF 8
OCP_REF 9
Charge Pump
Reg
UVLO
Logic
Pre-Driver p
PWM and p OCP Control
OSC Reg
2 OA
3 OA
16 OB
17...
