AN10907
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© NXP B.V. 2010. All rights reserved.
Application note
Rev. 1 — 28 December 2010
72 of 82
NXP Semiconductors
AN10907
TEA1613T resonant power supply control IC
The following list provides an association between pins and the protection states for which
they are being monitored:
•
SSHBC/EN:
When the TEA1613T lowers the voltage to this pin, it indicates a
protection with correction to high frequency. This is often caused by OCR/OCP.
•
RFMAX:
The voltage level on RFMAX indicates the oscillator frequency, which may
cause a high frequency protection when the voltage level is higher than 1.8 V.
•
CFMIN:
No proper detection of HB-slope or a possible capacitive mode detection can
be observed by a (partially) slow oscillator signal.
•
PGND and SGND:
If the TEA1613T detects HB operation while there is zero input
voltage, it indicates that the connection between these pins, directly at the IC, is not
present. Gate currents lead to false HB slope detection.
•
SNSCURHBC:
Any disturbances on this pin (voltage spikes) can lead to an increase
of frequency while the original measurement voltage/signal is ok.
•
SNSOUT/PFCON:
The voltage on this pin should be between 2.35 V and 3.5 V for
normal operation. To avoid protection, a voltage can be forced on it. But often it is
related (by a resistor divider) to the SUPIC and is correct when SUPIC is supplied
externally.
•
RCPROT:
Several protection functions can charge the timer.
Fig 56. Typical signals during a separate HBC start-up for an increase in V
boost
V
boost
= 100 V
HB slope is too slow for proper
detection -> High frequency
running
Increase output current -> HB slope
is fast enough for proper detection
-> Low frequency running by
"normal" SNSFB regulation
V
boost
= 0 V
V
boost
= 300 V
V
boost
= 40 V
V
boost
= 60 V
GATEHS
GATELS
CFMIN
HB
GATEHS
GATELS
CFMIN
HB
GATEHS
GATELS
CFMIN
HB
V
boost
= 100 V
V
boost
= 395 V
V
boost
= 350 V
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