Datenblatt-pdf.com


TEA18362LT Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer TEA18362LT
Beschreibung GreenChip SMPS control IC
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 29 Seiten
TEA18362LT Datasheet, Funktion
TEA18362LT
GreenChip SMPS control IC
Rev. 2 — 12 December 2013
Product data sheet
1. General description
The TEA18362LT is a controller IC for low-cost Switched Mode Power Supplies (SMPS).
It is intended for flyback topologies. The built-in green functions provide high efficiency at
all power levels.
At high power levels the flyback operates in Quasi-Resonant (QR) mode. At lower power
levels, the controller switches to Frequency Reduction (FR) or Discontinuous Conduction
Mode (DCM) and limits the peak current to approximately 25 % of the maximum peak
current. Valley switching is used in all operating modes.
At low power levels, when the flyback switching frequency drops below 25 kHz, the
flyback converter switches to burst mode. A special burst mode has been integrated
which reduces the opto current to a minimum level, ensuring high efficiency at low power
and excellent no load power performance. As the switching frequency in this mode has a
minimum value of 25 kHz while the burst frequency is below 800 Hz, the frequencies are
outside the audible range. During the non-switching phase of the burst mode, the internal
IC supply current is minimized for further efficiency optimization.
The TEA18362LT includes an accurate OverPower Protection (OPP). The OPP enables
the controller to operate in overpower situations for a limited amount of time. If the output
is shorted, the system switches to low-power mode where the output power is limited to a
lower level.
The TEA18362LT is manufactured in a high-voltage Silicon-On-Insulator (SOI) process.
The SOI process combines the advantages of a low-voltage process (accuracy,
high-speed protection, functions, and control), while maintaining the high-voltage
capabilities (high-voltage start-up, low standby power, and an integrated X-capacitor
discharge function).
The TEA18362LT enables low-cost, highly efficient and reliable supplies for power
requirements up to 75 W to be designed with a minimum number of external components.
All values mentioned in this data sheet are typical values, unless otherwise specified.






TEA18362LT Datasheet, Funktion
NXP Semiconductors
TEA18362LT
GreenChip SMPS control IC
+9
+9FKDUJH
9&&
21
9EURZQLQ
2))
9VWDUWXS
9WK 89/2
92
9,2 3527(&7
9GHW 3527(&7
9,2 &75/
9VWDUWXS &75/
VRIWVWDUW
9, ,6(16(
Fig 4. Start-up sequence and normal operation
9VHQVH PD[
9RSS ,6(16(
DDD
7.2 Modes of operation
The TEA18362LT operates in quasi-resonant mode, discontinuous conduction mode or
burst mode (see Figure 5). The auxiliary winding of the flyback transformer provides
demagnetization and valley detection.
TEA18362LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 12 December 2013
© NXP B.V. 2013. All rights reserved.
6 of 29

6 Page









TEA18362LT pdf, datenblatt
NXP Semiconductors
TEA18362LT
GreenChip SMPS control IC
to maximum 1.45 V. At room temperature the resistance value of the NTC resistor is much
higher than at high temperature. Due to the clamp, the current out of the PROTECT pin is
1.45 V divided by the resistance, which is significantly lower than 74 A.
A filter capacitor can be connected to this pin.
To avoid false triggering, an internal filter of 2 ms to 4 ms is applied.
The PROTECT pin can also be a power-down mode pin (see Section 7.10).
7.6.4 OverTemperature Protection (OTP)
Integrated OTP ensures that the IC stops switching if the junction temperature exceeds
the thermal temperature shutdown limit. OTP is a latched protection.
7.6.5 Maximum on-time
The controller limits the on-time of the external MOSFET to 55 s. When the on-time is
longer, the IC stops switching and enters safe restart mode.
7.6.6 Safe restart
If a protection is triggered and the system enters the safe restart mode, the system
restarts after 800 ms. Because the system is not switching, the VCC pin is supplied from
the mains via the HV pin.
After the 800 ms, the control IC measures the mains voltage. if the mains voltage exceeds
the brownin level, the control IC activates the PROTECT pin current source and the
internal voltage sources connected to the CTRL pin. Once the voltages on these pins
reach a minimum level, the soft start capacitor on the ISENSE pin is charged and the
system starts switching again.
The VCC is continuously regulated to the Vstartup level until the output voltage is within the
regulation level again.
7.6.7 Latched protection
If a protection is triggered and the system enters the latched protection mode, the VCC is
continuously regulated to the Vstartup level via the HV current source. As long as the AC
voltage remains, the system does not switch.
Removing the mains for a short time is the only possibility to restart the system.
7.6.8 Fast latch reset
Fast latch reset is a simple and fast method to reset the system when it is in latched
protection mode or safe restart mode. This function is used during production testing.
When the latched protection mode or safe restart mode is triggered, the voltage on pin
VCC is fast discharged by an internal current source (ICC(dch)); see Figure 10). The fast
discharge avoids an additional waiting period if the VCC voltage is high. When shorting
the mains, the waiting period is only the time of the discharge from Vstartup to Vrst.
TEA18362LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 12 December 2013
© NXP B.V. 2013. All rights reserved.
12 of 29

12 Page





SeitenGesamt 29 Seiten
PDF Download[ TEA18362LT Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
TEA18362LTGreenChip SMPS control ICNXP Semiconductors
NXP Semiconductors

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche