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TEA1713T Scheda tecnica(PDF) 10 Page - NXP Semiconductors

Il numero della parte TEA1713T
Spiegazioni elettronici  Resonant power supply control IC with PFC
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Produttore elettronici  NXP [NXP Semiconductors]
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TEA1713T_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 22 December 2009
10 of 45
NXP Semiconductors
TEA1713T
Resonant power supply control IC with PFC
7.4 Enable input (pin SSHBC/EN)
The power supply application can be completely disabled by pulling pin SSHBC/EN LOW.
Figure 4 illustrates the internal functionality. When a voltage is present on pin SUPHV or
on pin SUPIC, a current Ipu(EN) (typ. 42 μA) flows out of SSHBC/EN. If the pin is not
pulled-down, this current will lift the voltage up to Vpu(EN) (typ. 3 V). Since this voltage is
above both Ven(PFC)(EN) (typ. 1.2 V) and Ven(IC)(EN) (typ. 2.2 V), the IC will be completely
enabled.
The IC can be completely disabled by pulling the voltage on SSHBC/EN down below both
Ven(PFC)(EN) and Ven(IC)(EN) via an opto-coupler driven from the secondary side of the HBC
transformer (see Figure 4). The PFC controller will stop switching immediately, but the
HBC controller will continue switching until the low-side stroke is active. It is also possible
to control the voltage on SSHBC/EN from another circuit on the secondary side via a
diode. The external pull-down current must be larger than the internal soft start charge
current Iss(hf)(SSHBC).
If the voltage on SSHBC/EN is pulled down below Ven(IC)(EN), but not below Ven(PFC)(EN),
only the HBC will be disabled. This feature can be useful when another power converter is
connected to the boost voltage of the PFC.
The low-side power switch of the HBC will be on when the HBC is disabled via the
SSHBC/EN pin.
Boost charge
Boost voltage is built up by operational PFC.
Operational supply
Output voltage is generated. Both PFC and HBC controllers are fully operational.
Restart
Activated when a protection function is triggered. Restart timer is activated. During this time,
PFC and HBC controllers are disabled and CSUPREG is not charged. CSUPIC is charged.
Protection shut-down
Activated when a protection function is triggered. IC is not operational. PFC and HBC controllers
are disabled and CSUPIC and CSUPREG are not charged.
Table 3.
Operating states …continued
State
Description


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