TEA1731LTS Datasheet PDF - NXP

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TEA1731LTS
NXP

Part Number TEA1731LTS
Description GreenChip SMPS control IC
Page 19 Pages


TEA1731LTS datasheet pdf
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TEA1731LTS
GreenChip SMPS control IC
Rev. 2 — 16 August 2012
Product data sheet
1. General description
The TEA1731LTS is a low cost Switched Mode Power Supply (SMPS) controller IC
intended for flyback topologies. The TEA1731LTS operates in peak current and frequency
control mode. Frequency jitter has been implemented to reduce ElectroMagnetic
Interference (EMI). Slope compensation is integrated for Continuous Conduction Mode
(CCM) operation.
The TEA1731LTS IC features OverPower Protection (OPP). The controller accepts an
overpower situation for a limited amount of time.
One pin is reserved for protection purposes. OverTemperature Protection (OTP) can be
implemented with a minimal number of external components.
At low-power levels, the primary peak current is set to 25 % of the maximum peak current.
The switching frequency is reduced to limit the 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 TEA1731LTS makes the design of low cost, highly efficient and reliable supplies for
power requirements up to 75 W easier by requiring a minimum number of external
components.
2. Features and benefits
SMPS controller IC enabling low-cost applications
Large input voltage range (12 V to 30 V)
Integrated OverVoltage Protection (OVP) on VCC
Very low supply current during start-up and restart (10 A typical)
Low supply current during normal operation (0.58 mA typical without load)
Internal overpower time-out
Overpower or high/low line compensation (NXP patent: 81421271EP01)
Fixed switching frequency with frequency jitter to reduce EMI
Frequency reduction at medium power operation to maintain high efficiency
Frequency reduction with fixed minimum peak current to maintain high efficiency at
low output power levels
Frequency increase at peak power operation
Slope compensation for CCM operation
Adjustable soft start
Low and adjustable OverCurrent Protection (OCP) trip level



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NXP Semiconductors
TEA1731LTS
GreenChip SMPS control IC
Protection input (for external OTP and external OVP)
IC overtemperature protection
3. Applications
All applications that require an efficient and cost-effective power supply solution up to
75 W.
4. Ordering information
Table 1. Ordering information
Type number
Package
Name
Description
TEA1731LTS
TSOP6
plastic surface-mounted package; 6 leads
5. Block diagram
Version
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Fig 1. TEA1731LTS block diagram
TEA1731LTS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 16 August 2012
© NXP B.V. 2012. All rights reserved.
2 of 19



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6. Pinning information
6.1 Pinning
TEA1731LTS
GreenChip SMPS control IC
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Fig 2. TEA1731LTS pin configuration
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6.2 Pin description
Table 2. Pin description
Symbol
Pin
VCC
1
GND
2
PROTECT
3
CTRL
4
ISENSE
5
DRIVER
6
Description
supply voltage
ground
general-purpose protection input
control input
current sense input
gate driver output
TEA1731LTS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 16 August 2012
© NXP B.V. 2012. All rights reserved.
3 of 19



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NXP Semiconductors
TEA1731LTS
GreenChip SMPS control IC
7. Functional description
7.1 General control
The TEA1731LTS contains a controller for a flyback circuit. A typical configuration is
shown in Figure 3.
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Fig 3. TEA1731LTS typical configuration
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7.2 Start-up and UnderVoltage LockOut (UVLO)
Initially, the capacitor on the VCC pin, C3, is charged from the high-voltage mains via
resistor R1.
As long as VCC is below Vstartup, the IC current consumption is low (10 A typical). When
VCC reaches Vstartup, the IC first waits for the PROTECT pin to reach the Vdet(PROTECT)(L)
voltage. When Vdet(PROTECT)(L) is reached, the IC charges the ISENSE pin to the Vstart(soft)
level and then starts switching. In a typical application, the auxiliary winding of the
transformer takes over the supply voltage (see Figure 4).
If a protection is triggered, the controller stops switching. Depending on the protection
triggered, it either causes a restart or latches the converter to an off-state.
A restart protection disables the switching of the IC. The supply voltage of the IC drops to
the UVLO level. When the UVLO level is reached, the IC switches to Power-down mode,
where it consumes a low supply current (10 A typical). The switching recommences
when the VCC capacitor is recharged to Vstartup via R1.
When a latched protection is triggered, the TEA1731LTS immediately enters Power-down
mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage
(Vrst(latch) + 0.9 V).
TEA1731LTS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 16 August 2012
© NXP B.V. 2012. All rights reserved.
4 of 19



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