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PDF ( 数据手册 , 数据表 ) TEA1731LTS

零件编号 TEA1731LTS
描述 GreenChip SMPS control IC
制造商 NXP Semiconductors
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TEA1731LTS 数据手册, 描述, 功能
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







TEA1731LTS pdf, 数据表
NXP Semiconductors
TEA1731LTS
GreenChip SMPS control IC
7.11 Peak power, high-power, medium power and low-power operation
During high-power operation, with the converter running at a 65 kHz (typical) fixed
frequency, the power is controlled by varying the peak current. A peak-power mode is
implemented to supply a short overload situation. In peak-power mode, both frequency
and peak current are increased.
At reduced power levels, the converter enters the medium-power mode where the peak
current is reduced. The switching losses are reduced by lowering the switching frequency
to 27.5 kHz (typical).
When the power is further reduced to low power, a second frequency reduction is made.
In low-power operation, the switching frequency of the converter is reduced while the
peak current is set to 25 % of the maximum peak current (see Figure 6 and Figure 8).
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Fig 8. Frequency control
 
 
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7.12 Overpower or high/low line compensation
Overpower compensation is built in to compensate for high/low line. The maximum
continuous output power and the maximum peak power are about constant over the full
mains input voltage range (see Figure 9). The rectified mains input voltage is measured
by sensing the slope of the primary current from pin ISENSE. The slope information is
then used to adjust the primary current by subtracting an offset V(sense)offset from the
internal control voltage Vctrl(Ipeak) cycle-by-cycle (NXP patent: 81421271EP01).
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.
8 of 19







TEA1731LTS equivalent, schematic
NXP Semiconductors
TEA1731LTS
GreenChip SMPS control IC
13. Revision history
Table 6. Revision history
Document ID
Release date Data sheet status
Change notice Supersedes
TEA1731LTS v.2.1
Modifications:
20120816
Product data sheet
-
TEA1731LTS v.2
R4 value changed in Figure 10 “TEA1731LTS application diagram”.
TEA1731LTS v.2
20120731
Product data sheet
-
TEA1731LTS v.1
TEA1731LTS v.1
20120206
Objective data sheet
-
-
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.
16 of 19










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