ZSPM2000 datasheet(21/43 Pages) RENESAS

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ZSPM2000 Datasheet

January 27, 2016

3.4.

Fault Monitoring and Response Generation

The ZSPM2000 monitors various signals during operation. Depending on the selected configuration, it can

respond to events generated by these signals. A wide range of options is configurable via the Pink Power

Designer™ GUI. Typical monitoring within the ZSPM2000 is a three-step process. First, an event is detected via a

configurable set of thresholds. This event is then digitally filtered before the ZSPM2000 reacts with a configurable

response. For all monitored signals, a warning and a fault threshold can be configured. If enabled, a warning sets

a status flag (see sections 4.7.6 through 4.7.11), but does not trigger a response; whereas a fault also generates

a response.

Each warning and fault event can be individually enabled. The assertion of the SMBALERT signal can also be

configured to individual needs. An overview of the options and configuration is given in Table 3.2.

Table 3.2

Fault Configuration Overview

Signal

Response Type

Delay Resolution

Maximum Delay

Output Over-Voltage Fault

Low impedance*

500µs

90ms

Output Under-Voltage Fault

Low-impedance*

500µs

90ms

Input Over-Voltage Fault

High-impedance*

500µs

90ms

Input Under-Voltage Fault

High-impedance*

500µs

90ms

Over-Current Fault

Low-impedance*

500µs

90ms

External Over-Temperature Fault

Soft-Off*

5ms

900ms

Internal Over-Temperature Fault

Soft-Off*

5ms

900ms

* The default options shown can be changed via the Pink Power Designer™ GUI.

The ZSPM2000 supports different response types individually configurable for each fault. The “low-impedance”

response turns off the high-side external MOSFET and enables the low-side external MOSFET. After tOFF_MAX

(see Figure 3.2), both MOSFETs will be turned off. Conversely, a “high-Z” response will disable both MOSFETs

instantaneously. A “Soft-Off” response ramps the output voltage down similar to a power-down command. The

voltage will be ramped down to the value selected for VOFF_nom (see Figure 3.3). After tOFF_MAX, the controller will

disable the power stage by turning both switches off.

For each fault response, a delay and a retry setting can be configured via the Pink Power Designer™ GUI. If the

delay value is set to non-zero, the ZSPM2000 will not respond to a fault immediately. Instead it will delay the

response by the configured value and then reassess the signal. If the fault is still present, the appropriate

response will be triggered. If the fault is no longer present, the previous detection will be disregarded. The retry

setting configures the number of restarts of the power converter after a fault event. This number can be between

zero and seven, where a setting of seven represents an infinite retry operation. In analog controllers, this feature

is also known as “hiccup mode.”

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