Overview
The UC3770BN is a high-performance full-bridge driver IC designed by Texas Instruments for driving stepper motors. It offers enhanced current handling and lower saturation voltage compared to its predecessors, such as the UC3717 and UC3770. This device is part of the UC3770 series, which includes the UC3770A and UC3770B, with the UC3770BN being specifically tailored for applications requiring precise current control and high reliability.
The UC3770BN features LS-TTL compatible logic inputs, current sense, monostable, thermal shutdown, and a power H-bridge output stage. It supports full-step, half-step, and micro-step capabilities, making it versatile for various stepper motor applications. The device operates within a wide range of motor supply voltages from 10V to 50V and can handle bipolar output currents up to 2A.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage VM (Pins 3, 14) | 10 | 45 | 45 | V | |
| Logic Supply Voltage VCC (Pin 6) | 4.75 | 5 | 5.3 | V | |
| Logic Supply Current ICC (Pin 6) | IO = I1 = H, IM = 0 | 15 | 25 | 25 | mA |
| Thermal Shutdown Temperature | +170 | +170 | +170 | °C | |
| Logic Threshold (Pins 7, 8, 9) | 0.8 | 2.0 | 2.0 | V | |
| Output Current (Pins 1, 15) | ±2 | ±2 | ±2 | A | |
| Sink Driver Saturation Voltage | IM = 1.0A | 0.8 | 0.8 | 0.8 | V |
| Source Driver Saturation Voltage | IM = 1.0A | 1.3 | 1.3 | 1.3 | V |
Key Features
- Full-step, half-step, and micro-step capabilities
- Bipolar output current up to 2A
- Wide range of motor supply voltage: 10V to 50V
- Low saturation voltage
- Wide range of current control: 5mA to 2A, selectable in steps or varied continuously
- LS-TTL compatible logic inputs
- Current sense, monostable, and thermal shutdown features
- Power H-bridge output stage
- Thermal protection and soft intervention
Applications
The UC3770BN is designed for use in a variety of stepper motor applications, including but not limited to:
- Industrial automation systems
- Medical equipment
- 3D printing and CNC machines
- Robotics and mechatronics
- High-precision positioning systems
Q & A
- What is the maximum output current of the UC3770BN?
The UC3770BN can handle bipolar output currents up to 2A.
- What is the operating temperature range of the UC3770BN?
The device is specified for operation from 0°C to 70°C ambient.
- What are the logic supply voltage requirements for the UC3770BN?
The logic supply voltage (VCC) should be between 4.75V and 5.3V.
- Does the UC3770BN support micro-stepping?
Yes, the UC3770BN supports full-step, half-step, and micro-step capabilities.
- What is the thermal shutdown temperature of the UC3770BN?
The thermal shutdown temperature is +170°C.
- Can the UC3770BN be used in high-voltage applications?
The UC3770BN can operate with motor supply voltages ranging from 10V to 50V.
- What are the current sense thresholds for the UC3770BN?
The current sense thresholds for the UC3770BN are tailored for half-stepping applications with 50%, 71%, and 100% current levels.
- Does the UC3770BN require external high-side clamp diodes?
Yes, the UC3770BN requires external high-side clamp diodes.
- What is the typical logic supply current for the UC3770BN?
The typical logic supply current (ICC) is 25mA when IO = I1 = H and IM = 0.
- Is the UC3770BN RoHS compliant?
Yes, the UC3770BN is RoHS compliant and also meets the Green (low halogen) requirements.
