General description

VIPer0P

22/36

DocID028423 Rev 2

In case of ZPM management by MCU only (see Figure 30: "ZPM fully managed by MCU")

the MCU shuts down the SMPS by pulling low OFF and wakes it up as well by pulling low

ON. Two of its GPIOs are used. The MCU is powered also during ZPM using the resistive

, 45 kΩ typical), provided that it is rated for 3.3 V supply

voltage, and equipped with an ultra-low consumption Standby Mode.

Since in ZPM the device is supplied with extremely low current, it is naturally prone to pick

up noise. If the device is required to work in a noisy environment, it is recommended to

connect a film capacitor (tens to some hundreds pF) across ON and OFF versus SGND. If

the device is disconnected from the mains or there is a mains interruption while in ZPM, the

information in the logic is lost. When the input source is applied again, the IC will be

restarted in normal mode.

The ultimate aim of ZPM function is to enable the realization of PSUs able to comply with

the European regulation 1275/2008 as far as the standby and off-mode power consumption

of appliances is concerned. To meet this target a careful system-level design is required.

The total input consumption is therefore reduced to the residual consumption lower than 4

minimum accuracy of the standby power measurements.

Figure 29: ZPM managed in mixed mode

Figure 30: ZPM fully managed by MCU

VIPer0P

OFF

MCU

V

AUX

GPIO

ON

Power-ON

Active low output

C

B

GIPD280420151131MT

VIPer0P

Active low

outputs

ON

V

AUX

OFF

Power-ON/OFF

45 k

W

4 V

MCU

GPIO

GPIO

C

B

GIPD250820151513FSR