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Número de pieza | TEA1731LTS | |
Descripción | GreenChip SMPS control IC | |
Fabricantes | NXP Semiconductors | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de TEA1731LTS (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
No Preview Available ! 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
1 page NXP Semiconductors
TEA1731LTS
GreenChip SMPS control IC
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Fig 4. Start-up sequence, normal operation and latched protection
When the voltage on pin VCC drops below the Vth(UVLO) level during normal operation, the
controller stops switching. A VCC undervoltage, which does not occur during a start-up
event, latches the IC in an off-state.
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 Overvoltage protection (pin VCC)
An OverVoltage Protection (OVP) circuit is connected to the VCC pin. When the VCC
exceeds Vth(OVP) (30 V typical) for four consecutive switching cycles, the IC triggers the
latched protection. When VCC drops below Vth(OVP) before count = 4 is reached, the
counter is reset to zero.
If a lower over voltage protection level is needed, a Zener diode can be connected
between pins VCC and PROTECT.
7.5 Protection input (pin PROTECT)
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) (0.8 V typical) or below Vdet(L)(PROTECT) (0.5 V typical) for
four consecutive converter strokes. A current of 32 A (typical) flows out of the chip when
the pin voltage is Vdet(L)(PROTECT). A current of 107 A (typical.) flows into the chip when
the pin voltage is Vdet(H)(PROTECT).
The PROTECT input can be used for creating an (additional) overvoltage detection and
an external OverTemperature Protection (OTP) function.
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.
5 of 19
5 Page NXP Semiconductors
TEA1731LTS
GreenChip SMPS control IC
10. Characteristics
Table 5. Characteristics
Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the
IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
Supply voltage management (pin VCC)
Vstartup
Vth(UVLO)
start-up voltage
undervoltage lockout
threshold voltage
19.3 21.5 23.8 V
11.2 12.5 13.8 V
Vth(ovp)
overvoltage
protection threshold
voltage
29 30 31 V
Ncy(ovp)
number of
overvoltage
protection cycles
-4
-
Vclamp(VCC)
clamp voltage on pin activated during latched
VCC
protection; ICC = 100 A
-
Vrst(latch) + 0.9 -
V
activated during latched
protection, ICC = 1 mA
-
-
Vrst(latch) + 3.5 V
ICC(restart)
restart supply current
1 2.5
-
mA
Vhys
hysteresis voltage
Vstartup - Vth(UVLO)
6.6 9.1
11.6 V
ICC(startup)
start-up supply
current
VCC < Vstartup
5 10 15 A
ICC(oper)
operating supply
current
no-load on pin DRIVER;
= 2 %; excluding
optocurrent
-
0.58
-
mA
no-load on pin DRIVER;
= 25 %, excluding
optocurrent
-
0.62
-
mA
Vrst(latch)
latched reset voltage
Protection input (pin PROTECT)
3.5 4.5 5.5 V
Vdet(L)(PROTECT) LOW-level detection
voltage on pin
PROTECT
0.47 0.50 0.53 V
Vdet(H)(PROTECT) HIGH-level detection
voltage on pin
PROTECT
0.75 0.8
0.85 V
IO(PROTECT)
output current on pin VPROTECT = Vlow(PROTECT)
34
32
30
A
PROTECT
VPROTECT = Vhigh(PROTECT)
87
107
127
A
Vclamp(PROTECT) clamp voltage on pin II(PROTECT) = 200 A
[1] 3.5
4.1
4.7
V
PROTECT
Peak current control (pin CTRL)
VCTRL
voltage on pin CTRL for minimum flyback peak
1
1.3
1.6
V
current
Rint(CTRL)
internal resistance on
pin CTRL
5 7 9 k
IO(CTRL)
output current on pin VCTRL = 1.4 V
CTRL
0.7 0.5 0.3 mA
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.
11 of 19
11 Page |
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