Getting Started With the TAA3033DB1649 Automotive Demo Board for Precharge Application

2.1 Ringo Development Software with GUI

The TAA3033 Ringo software with GUI enables communication with the integrated circuit (IC) using a PC and the RDK01DB1563 USB-to-inter-integrated circuit (USB-to-I²C) interface kit. When used with the demo board, the Ringo GUI supports development and evaluation. The tool enables:

• Reading the parameter settings and status signals from the IC
• Configuring adjustable parameters
• Adapting protection settings to match application requirements

Refer to UM12429 for detailed information on GUI setup, features and operation.

3.1 Specifications

The table below provides furtherdetails for the TAA3033DB1649 demo board.

Table 1. Specifications.

3.2 AA3033 Features and Benefits

The following application and control features highlight the key capabilities of the TAA3033.

Application Features

• Grade 1 qualified (-40 °C to +125 °C ambient temperature range)
• Wide supply voltage range: 11 V to 36 V
• Supports low-side and high-side operation
• Suitable for driving silicon (Si) and silicon carbide (SiC) power MOSFETs
• I²C interface for configuration of control parameters
• Enables input to start the precharging cycle
• Ready output indicates completion of precharging cycle
• Fault output signals triggered protections against switching and connection failures
• Small outline SO14 package

Control Features

• Regulated precharge current with continuous conduction mode (CCM) control
• Peak current and ripple adjustable by internal comparator level and external sense resistor
• Wide duty cycle range: 0.1 % to 99.9 %
• Precharging starts with a low duty cycle to prevent current runaway
• Precharging ends by operating at maximum duty cycle

4.1 Test Setup and Equipment

To demonstrate the performance of the TAA3033DB1649 demo board, a test setup is used to charge a 1 mF capacitor to 800 V. The test equipment includes:

• Oscilloscope: Yokogawa DLM5038
• High-voltage direct current (HVDC) power source: ITECH bidirectional DC source IT-M3906C-1500-12
• DC power supply: E36312A programmable DC power supply
• DC-link capacitor: polypropylene 1000 μF, 900 V, 10 %

Figure 3 shows the test setup with the demo board. To prevent reverse current flow during evaluation, an external diode is connected externally in series between the positive terminal of the HVDC power supply and the BAT+ terminal of the demo board.

A fuse is also connected externally in series with the diode. For accurate measurement with minimum disturbance to the application, the sense signal must be measured close to the IC (see Figure 4).

As shown in Figure 4, a 1:1 probe is connected directly across capacitor C3 to measure of the sense node capacitor (SNC) signal. A differential probe is used to measure the capacitor voltage (VCAP). Several test points are provided across the demo board to measure signals such as Enable, Fault, Ready, Vcc, switching node voltage and Gate. The board also includes a solder-blob jumper which is shorted by default.

The solder bridge may be opened and an external wire loop attached for inductor current measurement.

TAA3033DB1649

TAA3033DB1649

Figure 4. SNC Signal Measurement.

4.2 Test Procedure

This section describes the test procedure for evaluating the demo board. The same procedure can be used to evaluate both the TAA3033DB1649 and TAA3033DB1650 demo boards.

If the IC is already programmed with the required settings, follow these steps:

1. Turn on supply voltage (VCC) at 24 V and 1 A
2. Turn on the DC voltage source at 800 V or 400 V
3. Pull the enable (ENA) pin high to 5 V to start precharging
4. At the end of precharging, turn off and disconnect the DC source
5. Pull the ENA pin low and discharge the capacitor

To evaluate the precharge operation with other configurable settings, follow this procedure:

1. Turn on VCC at 24 V and 1 A
2. Pull the ready (RDY) pin high to 5 V
3. Pull the ENA pin high to 5 V
4. Use the Ringo graphical user interface (GUI) to program the IC with the required settings
5. Turn on the DC voltage source at 800 V or 400 V
6. Pull the RDY pin low to start precharging
7. At the end of precharging, turn off and disconnect the DC source
8. Pull the ENA pin low and discharge the capacitor

4.3 Startup Behavior

When the applied VCC voltage exceeds the start threshold and the voltage at the enable pin exceeds the enable threshold, the IC operation starts (see Table 1). Figure 5 shows the startup behavior at zero battery voltage.

The oscilloscope channels are assigned as follows:

1. Channel 1 (CH1): Enable (ENA)
2. Channel 2 (CH2): Ready (RDY)
3. Channel 3 (CH3): Fault (FLTN)
4. Channel 5 (CH5): Gate (GATE)

When the voltage at the enable pin exceeds the threshold, the fault pin goes high and the gate switching starts. Gate switching starts at the minimum duty cycle and then increases. The RDY pin remains low until the end of precharging operation.

Figure 5. Startup Behavior.

Board Information

• UM12428, TAA3033DB1649 Automotive Demo Board for Precharge Application
• Ringo TAA3033 Development Software with GUI User Manual
• TAA3033DB1649 Design Files
• Active Precharge Controller Design Tool for TAA3033

Software

• Ringo TAA3033 Software