ZSPM2000 Datasheet

© 2016 Integrated Device Technology, Inc.

22

January 27, 2016

3.4.1.

Output Over/Under-Voltage

To prevent damage to the load, the ZSPM2000 utilizes an output over-voltage protection circuit. The voltage at

VFBP is continuously compared with a configurable threshold using a high-speed analog comparator. If the

voltage exceeds the configured threshold, the fault response is generated and the PWM outputs are turned off.

The voltage fault level is generated by a 6-bit DAC with a reference voltage of 1.60V resulting in 25mV resolution.

Additionally, the output voltage is sampled using the HKADC and continuously compared with an output over-

voltage warning threshold. If the output voltage exceeds this threshold, a warning is generated and the

preconfigured actions for the SMBALERT pin are triggered.

The ZSPM2000 also monitors the output voltage with two lower thresholds. If the output voltage is below the

under-voltage warning level and above the under-voltage fault level, an output voltage under-voltage warning is

triggered. If the output voltage falls below the fault level, a fault event is generated and the configured response is

activated.

3.4.2.

Output Current Protection and Limiting

The ZSPM2000 continuously monitors the average inductor current and utilizes this information to protect the

power supply from excessive output current. Two different types of protection are configurable independently.

Output current limiting to a value configurable via the Pink Power Designer™ GUI is supported by reducing the

output voltage. Additionally, the maximum output current warning and fault threshold can be used to shut down

the ZSPM2000. Both features can be enabled independently. If the over-current fault threshold is chosen below

the current limiting threshold, the ZSPM2000 will shut down without going into current limiting mode.

3.4.3.

Over-Temperature Protection

The ZSPM2000 monitors internal and external temperature. For each, a warning and a fault level can be con-

figured and an appropriate response can be enabled.