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TEA18362LT Scheda tecnica(PDF) 8 Page - NXP Semiconductors

Il numero della parte TEA18362LT
Spiegazioni elettronici  GreenChip SMPS control IC
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Produttore elettronici  PHILIPS [NXP Semiconductors]
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TEA18362LT
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Product data sheet
Rev. 2 — 12 December 2013
8 of 29
NXP Semiconductors
TEA18362LT
GreenChip SMPS control IC
7.4 Mains voltage measuring
In a typical application, the mains input voltage is measured using the HV pin.
Once per ms the mains voltage is measured by pulling down the HV pin to ground and
measuring its current. This current then reflects the input voltage.
The system determines if the mains voltage exceeds the brownin level or it is
disconnected using an analog-to-digital converter and digital control (see Figure 1).
Once the mains is above the brownin level, the system is allowed to start switching
(see Figure 6).
If the mains voltage is continuously below the brownout level for a period of at least
30 ms, a brownout is detected and the system immediately stops switching. This period is
required to avoid that the system stops switching due to the zero crossings of the mains or
during a short mains interruption.
When the mains voltage is measured by pulling the HV pin to ground, the digital control
calculates if there is a positive dV/dt at the mains. A positive dV/dt implies that a mains is
connected.
Once a mains is detected, the measuring of the mains input voltage is stopped for a
period of 6 ms to improve efficiency. In burst mode this waiting period is enlarged to 97 ms
to improve efficiency.
A positive dV/dt is measured when succeeding samples cross the brownin level (Ibi(HV)) or
the mains high level (IIH(HV); see Figure 7).
Fig 6.
Mains voltage measuring
Fig 7.
Detecting mains connection by +dV/dt


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