ON Semiconductor NCV890201GEVB User Manual

© Semiconductor Components Industries, LLC, 2011

December, 2011 − Rev. P1

1 Publication Order Number:

EVBUM2050/D

NCV890201GEVB

NCV890201 Automotive
Grade High-Frequency
Buck Regulator Evaluation
Board User's Manual

Description

The NCV890201 demonstration board provides a convenient way to
evaluate a high-frequency buck converter design. No additional
components are required, other than dc supplies for the input and
enable voltages. An external clock can be used to synchronize the
switching frequency; and the board also provides a synchronization
output, enabling it to be used as a master. It is configured for a 3.3 V
output with a 2 MHz switching frequency and a 2.0 A maximum
output current, over the typical 4.5 V to 18 V automotive input voltage
range. In addition, the board regulates up to 36 V thanks to switching
frequency foldback.

Key Features

• 3.3 V Output Voltage

• 2 MHz Switching Frequency

• 2.0 A Current Limit

• Wide Input Voltage of 4.5 V to 36 V

• Regulates through Load Dump Conditions

• External Clock Synchronization up to 2.5 MHz

• Synchronization Output

• Automotive Grade

Figure 1. NCV890201GEVB Board Picture

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EVAL BOARD USER’S MANUAL

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Table 1. DEMONSTRATION BOARD TERMINALS

Terminal Function

VIN Positive dc input voltage

GND Common dc return

VOUT Regulated dc output voltage

EN Enable input

SYNCI Input for external clock synchronization

SYNCO Output for synchronizing other boards

Table 2. ABSOLUTE MAXIMUM RATINGS

(Voltages are with respect to GND)

Rating

Value Units

Dc supply voltage (VIN, EN) -0.3 to 36 V V

Dc supply voltage (SYNCI) -0.3 to 6 V V

Junction Temperature (NCV890201) -40 to 150 °C

Ambient temperature (Demo Board) -40 to 85 °C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation
above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended
Operating Conditions may affect device reliability.

Table 3. ELECTRICAL CHARACTERISTICS

(TA = 25°C, 4.5 V ≤ VIN ≤ 40 V, VEN = 2 V, V

OUT

= 3.3 V, 0 ≤ I

OUT

≤ 2.0 A, unless otherwise specified)

Characteristics

Conditions Typical Value Units

Regulation

Output Voltage 3.30 V

Voltage Accuracy 4 %

Line Regulation I

OUT

= 1.0 A 0.12 %

Load Regulation VIN = 13.2 V 0.03 %

Switching

Switching Frequency 2.0 MHz

Soft-start Time 1.4 ms

SYNCI Frequency range 1.8 to 2.5 MHz

Current Limit

Average Current Limit VIN = 6 to 18 V 1.8 A

Cycle-by-cycle Current Limit 2.45 A

Protections

Input Undervoltage Lockout (UVLO) VIN decreasing 4.2 V

Thermal Shutdown TA increasing 170 °C

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Figure 2. NCV890201GEVB Board Schematic

Operational Guidelines

1. Connect a dc input voltage, within the 4.5 V to 36 V range, between VIN and GND

2. Connect a load between VOUT and GND

3. Connect a dc enable voltage, within the 4.5 V to 36 V range, between EN and GND

4. Optionally, for external clock synchronization, connect a pulse source between SYNCI and GND. The high state level
should be within the 2 to 6 V range, and the low state level within the -0.3 V to 0.8 V range, with a minimum pulse
width of 40 ns and a frequency within the 1.8 to 2.5 MHz range.

Figure 3. NCV890201GEVB Board Connections

V

IN

V

EN

Z

OUT

V

SYNCI

I

OUT