TEA18361LT Datasheet PDF - NXP

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TEA18361LT
NXP

Part Number TEA18361LT
Description GreenChip SMPS control IC
Page 29 Pages


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TEA18361LT
GreenChip SMPS control IC
Rev. 2 — 12 December 2013
Product data sheet
1. General description
The TEA18361LT 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 TEA18361LT 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 TEA18361LT 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 TEA18361LT 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.



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NXP Semiconductors
TEA18361LT
GreenChip SMPS control IC
2. Features and benefits
2.1 General features
SMPS controller IC for low-cost applications
Large supply voltage range (up to 30 V)
Integrated high-voltage start-up
Continuous VCC regulation during start-up and protection via the HV pin, allowing a
minimum VCC capacitor value
Reduced opto current in burst mode enabling low no load power consumption
Operating frequencies in all operating modes are outside the audible area
Integrated X-capacitor discharge; NXP Semiconductors patented
(Patent reference: 81512184EP01 (Patent pending))
Adjustable soft start
Power-down mode via the PROTECT pin
2.2 Green features
Low supply current during normal operation (0.6 mA without load)
Low supply current during non-switching state in burst mode (0.2 mA)
Valley switching for minimum switching losses
Frequency reduction with fixed minimum peak current to maintain high efficiency at
low output power levels
2.3 Protection features
Mains voltage independent OverPower Protection (OPP)
OverTemperature Protection (OTP)
Integrated overpower time-out
Integrated restart timer for system fault conditions
Continuous mode protection using demagnetization detection
Accurate OverVoltage Protection (OVP)
General-purpose input for latched protection; for use with system OverTemperature
Protection (OTP)
Driver maximum on-time protection
3. Applications
Applications requiring efficient and cost-effective power supply solutions up to 75 W
4. Ordering information
Table 1. Ordering information
Type number
Package
Name
Description
TEA18361LT/1
SO14
plastic small outline package; 14 leads; body width 3.9 mm
Version
SOT108-1
TEA18361LT
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.
2 of 29



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NXP Semiconductors
6. Pinning information
6.1 Pinning
TEA18361LT
GreenChip SMPS control IC
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6.2 Pin description
Table 2.
Pin
VCC
GND
n.c.
DRIVER
n.c.
ISENSE
n.c
n.c.
AUX
Pin descriptions
Pin number
1
2
3
4
5
6
7
8
9
CTRL
PROTECT
n.c.
n.c.
HV
10
11
12
13
14
Description
supply voltage
ground
not connected
gate driver output
not connected
current sense input
not connected
not connected
auxiliary winding input for demagnetization timing, valley
detect, overpower correction, and OVP
control input
general purpose protection input; pin for power-down mode
high-voltage safety spacer; not connected
high-voltage safety spacer; not connected
high voltage start-up; active X-capacitor discharge
TEA18361LT
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.
4 of 29



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NXP
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