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PDF TEA1733L Data sheet ( Hoja de datos )

Número de pieza TEA1733L
Descripción GreenChip SMPS control IC
Fabricantes NXP Semiconductors 
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TEA1733(L)
GreenChip SMPS control IC
Rev. 01.11 — 10 July 2009
Objective specification
1. General description
The TEA1733 is a low cost Switched Mode Power Supply (SMPS) controller IC intended
for flyback topologies.
The TEA1733 operates in fixed frequency mode. To reduce EMI, frequency jitter has been
implemented. For Continuous Conduction Mode (CCM) operation, slope compensation is
integrated. The controller can be set to accept an over-power situation for a limited
amount of time.
Two pins are reserved for protection purposes. Input under and over voltage protection,
output over voltage protection and over temperature protection 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
and 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 TEA1733 enable 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
2.1 Features
„ SMPS controller IC enabling low cost applications
„ Large input voltage range (12V up to 30V)
„ Very low supply current during start-up and restart (typ. 10μA)
„ Low supply current during normal operation (typ. 500μA without load)
„ Over-power compensation
„ Adjustable over-power time-out
„ Adjustable over-power restart timer
„ Fixed switching frequency with frequency jitter to reduce EMI
„ Frequency reduction with fixed minimum peak current at low power operation to
maintain high efficiency at low output power levels
„ Slope compensation for CCM operation
„ Low and adjustable over current protection (OCP) trip level
„ Soft start
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TEA1733L pdf
NXP Semiconductors
TEA1733
GreenChip SMPS control IC
7. Functional description
7.1 General control
The TEA1733 contains a controller for a flyback circuit. A typical configuration is shown in
Figure 3.
VINSENSE 5
PROTECT 6
Θ
CTRL 7
OPTIMER 8
4 ISENSE
3 DRIVER
2 GND
1 VCC
Typical _configuration
Fig 3. Typical configuration
7.2 Start-up and under voltage lock-out
Initially the capacitor on the VCC pin is charged from the high voltage mains via a resistor.
As long as VCC is below Vstartup, the IC current consumption is low (typ. 10μA). When VCC
reaches Vstartup the IC first waits for the VINSENSE pin to reach the Vlow(VINSENSE) voltage
and for the PROTECT pin to reach the Vlow(PROTECT) voltage. When both level are
reached, the IC charges the ISENSE pin to the Vstart(soft) level and than starts switching. In
a typical application the supply voltage is taken over by the auxiliary winding of the
transformer.
If a protection is triggered the controller will stop switching. Dependent on which
protection is triggered and dependent on the version of the IC (TEA1733 or TEA1733L)
the protection will cause a re-start or will latch the converter in an off-state.
A re-start caused by a protection will charge the OPTIMER pin to 4.5V (typ.) rapidly. The
TEA1733 will than enter the power-down mode until the OPTIMER pin is discharged to
1.2V (typ.). During the power-down mode, the IC consumes a very low supply current
(10μA typ.) and the VCC pin will be clamped to 22V (typ) by an internal clamp circuit. A
restart will be made when the voltage on pin OPTIMER drops below 1.2V (typ.) and the
VCC pin voltage is above the VCC start-up voltage.
When a latched protection is triggered, the TEA1733 will enter the power-down mode
immediately. The VCC pin will be clamped to a voltage just above the latch protection
reset voltage (Vreset(Latch)+1V) (See Figure 4)
TEA1733
Objective specification
Rev. 01.11 — 10 July 2009
© NXP B.V. 2009. All rights reserved.
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TEA1733L arduino
NXP Semiconductors
TEA1733
GreenChip SMPS control IC
9. Thermal characteristics
Table 4. Thermal characteristics
Symbol
Parameter
Conditions
Typ Unit
Rth(j-a)
thermal resistance from
in free air; JEDEC test board
150
K/W
junction to ambient
Rth(j-c)
thermal resistance from
junction to case
in free air; JEDEC test board
79
K/W
10. Characteristics
Table 5. Characteristics
Tamb = 25 °C; VCC = 20 V; all voltages are measured with respect to ground (pin 6); 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
under voltage lockout threshold
voltage
18.6 20.6 22.6 V
11.2 12.2 13.2 V
Vclamp(VCC)
Clamp voltage on pin VCC
Activated during restart
Vstartup
+1
V
Activated during latched
protection
Vreset
(latch)
+1
Vhys
hysteresis voltage
Vstartup Vth(UVLO)
ICC(startup)
startup supply current
VCC < Vstartup
ICC(oper)
operating supply current
no load on pin DRIVER
Vreset (latch)
latched protection reset voltage
Input Voltage Sensing (pin VINSENSE)
891 0 V
51 0 15 μA
0.4 0.5 0.6 mA
456V
Vstart(VINSENSE)
Vlow(VINSENSE)
Input voltage detection level
Low input voltage detection
level
0.89 0.94 0.99 V
0.68 0.72 0.76 V
Vhigh(VINSENSE)
High input voltage detection
level
3.39 3.52 3.65 V
IO(VINSENSE)
output current in pin
VINSENSE
-20 nA
Vclamp(VINSENSE)
Clamp voltage on pin
VINSENSE
IVINSENSE=50μA4
.6 V
Protection input (pin PROTECT)
Vlow(PROTECT)
Vhigh(PROTECT)
IO(PROTECT)
low protection voltage
high protection voltage
output current on pin
PROTECT
VVINSENSE=Vlow(PROTECT)
0.47 0.50 0.53 V
0.75 0.8 0.85 V
34 32 30 μA
Vclamp(PROTECT)
Clamp voltage on pin
PROTECT
VVINSENSE=Vhigh(PROTECT)
IPROTECT=200μA
87
[1] 3.5
107 127 μA
4.1 4.7 V
TEA1733
Objective specification
Rev. 01.11 — 10 July 2009
© NXP B.V. 2009. All rights reserved.
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