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TEA1522T Datasheet(PDF) 7 Page - NXP Semiconductors

No. de pieza TEA1522T
Descripción Electrónicos  SMPS ICs for low-power systems
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Fabricante Electrónico  NXP [NXP Semiconductors]
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TEA1522T Datasheet(HTML) 7 Page - NXP Semiconductors

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TEA152X
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 04 — 14 September 2010
7 of 20
NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
8.5 Demagnetization
The system operates in discontinuous conduction mode all the time. As long as the
secondary stroke has not ended, the oscillator will not start a new primary stroke. During
the first tsuppr seconds, demagnetization recognition is suppressed. This suppression may
be necessary in applications where the transformer has a large leakage inductance and at
low output voltages.
8.6 Minimum and maximum duty factor
The minimum duty factor of the switched mode power supply is 0 %. The maximum duty
factor is set to 75 % (typical value at 100 kHz oscillation frequency).
8.7 OverCurrent Protection (OCP)
The cycle-by-cycle peak drain current limit circuit uses the external source resistor RI to
measure the current. The circuit is activated after the leading edge blanking time tleb. The
protection circuit limits the source voltage to Vsource(max), and thus limits the primary peak
current.
8.8 Short-circuit winding protection
The short-circuit winding protection circuit is also activated after the leading edge blanking
time. If the source voltage exceeds the short-circuit winding protection voltage Vswp, the IC
stops switching. Only a power-on reset will restart normal operation. The short-circuit
winding protection also protects in case of a secondary diode short circuit.
8.9 OverTemperature Protection (OTP)
An accurate temperature protection is provided in the device. When the junction
temperature exceeds the thermal shutdown temperature, the IC stops switching. During
thermal protection, the IC current is lowered to the start-up current. The IC continues
normal operation as soon as the overtemperature situation has disappeared.
Fig 5.
Typical phase of drain ringing at switch-on (at N
× V
o =80V)
0
200
400
800
f (kHz)
phase
(deg)
40
20
−20
−40
0
mgt424
600


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