ZSPM4012B Datasheet, PDF (15/23 Pages) List of Unclassifed Manufacturers – High Efficiency 2A Synchronous Buck Converter

ZSPM4012B
High Efficiency 2A Synchronous Buck Converter
3.2.5. Output Over-Voltage Protection
If the output of the regulator exceeds 103% of the regulation voltage, the output over-voltage (OUT-OV) protection
circuit will set the VSW outputs to the tri-state level to protect the ZSPM4012B from damage. (See Figure 3.2.)
This check occurs at the start of each switching cycle. If it occurs during the middle of a cycle, the switching for
that cycle will complete and the VSW outputs will tri-state at the start of the next cycle.
3.2.6. Output Under-Voltage Monitoring
The switched mode output voltage is also monitored by the output under-voltage circuit (OUT-UV) as shown in
Figure 3.2. The PG line remains low until the output voltage reaches the V_OUT-UV threshold (see Table 1.5). Once
the internal comparator detects that the output voltage is above the desired threshold, an internal delay timer is
activated and the PG line is de-asserted (to high) once this delay timer expires. In the event that the output
voltage decreases below V_OUT-UV, the PG line will be asserted low and remain low until the output rises above
V_OUT-UV and the delay timer times out. There is a hysteresis for the V_OUT-UV threshold (see Table 1.5).
Data Sheet
April 4, 2013
© 2013 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
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