TEA1733AT Datasheet PDF - NXP Semiconductors
| Part Number | TEA1733AT | |
| Description | GreenChip SMPS control IC | |
| Manufacturers | NXP Semiconductors | |
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TEA1733AT
GreenChip SMPS control IC
Rev. 3 — 24 May 2013
Product data sheet
1. General description
The TEA1733AT is a low cost Switched Mode Power Supply (SMPS) controller IC
intended for flyback topologies. It operates in fixed frequency mode. Frequency jitter has
been implemented to reduce ElectroMagnetic Interference (EMI). Slope compensation is
integrated for Continuous Conduction Mode (CCM) operation.
The TEA1733AT IC includes OverPower Protection (OPP). This enables the controller to
operate under overpower situations for a limited amount of time.
Two pins, VINSENSE and PROTECT, are reserved for protection purposes. Input
UnderVoltage Protection (UVP) and OverVoltage Protection (OVP), output OVP and
OverTemperature Protection (OTP) can be implemented using a minimal number of
external components.
At low power levels the primary peak current is set to 25 % of the maximum peak current
and the switching frequency is reduced to limit switching losses. The combination of fixed
frequency operation at high output power and frequency reduction at low output power
provides high-efficiency over the total load range.
The TEA1733AT enables low cost, highly efficient and reliable supplies for power
requirements up to 75 W to be designed easily and with a minimum number of external
components.
2. Features and benefits
2.1 Features
SMPS controller IC enabling low-cost applications
Large input voltage range (12 V to 30 V)
Very low supply current during start-up and restart (typically 10 A)
Low supply current during normal operation (typically 0.55 mA without load)
Overpower or high/low line compensation
Adjustable overpower time-out
Adjustable overpower restart timer
Fixed switching frequency with frequency jitter to reduce EMI
Frequency reduction with fixed minimum peak current to maintain high-efficiency at
low output power levels
Slope compensation for CCM operation
Low and adjustable OverCurrent Protection (OCP) trip level
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NXP Semiconductors
TEA1733AT
GreenChip SMPS control IC
VCC
ISENSE
VINSENSE
PROTECT
OPTIMER
soft start
Vstartup
Vth(UVLO)
soft start
Vdet(H)(VINSENSE)
Vdet(H)(PROTECT)
Vdet(L)(PROTECT)
4.5 V
1.2 V
VO
charging VCC
capacitor
starting
converter
normal
operation
(power down)
protection
restart
014aaa929
Fig 4. Start-up sequence, normal operation and restart sequence
When the voltage on pin VCC drops below the UVLO level during normal operation, the
controller stops switching and enters Restart mode. In Restart mode, the driver output is
disabled and the VCC pin voltage is recharged via resistor R3 to the rectified mains
voltage.
7.3 Supply management
All internal reference voltages are derived from a temperature compensated on-chip band
gap circuit. Internal reference currents are derived from a trimmed and temperature
compensated current reference circuit.
7.4 Input voltage detection (VINSENSE pin)
In a typical application the mains input voltage can be detected by the VINSENSE pin.
Switching will not take place until the voltage on VINSENSE has reached the
Vstart(VINSENSE) voltage (typically 0.94 V).
When the VINSENSE voltage drops below Vdet(L)(VINSENSE) (typically 0.72 V) or exceeds
Vdet(H)(VINSENSE) (typically 3.52 V), the converter stops switching and performs a restart.
If pin VINSENSE is left open or disconnected, the pin is pulled up by the internal 20 nA
(typical) current source to reach the Vdet(H)(VINSENSE) level. This triggers a restart
protection.
An internal clamp of 5.2 V (typical) protects this pin from excessive voltages.
7.5 Protection input (PROTECT pin)
Pin PROTECT is a general purpose input pin, which can be used to switch off the
converter (latched protection). The converter is stopped when the voltage on this pin is
pulled above Vdet(H)(PROTECT) (typically 0.8 V) or below Vdet(L)(PROTECT) (typically 0.5 V). A
TEA1733AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 24 May 2013
© NXP B.V. 2013. All rights reserved.
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| Information | Total 19 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ TEA1733AT.PDF Datasheet ] | |
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