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PDF TEA1733MT Data sheet ( Hoja de datos )
| Número de pieza | TEA1733MT | |
| Descripción | GreenChip SMPS control IC | |
| Fabricantes | NXP Semiconductors | |
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TEA1733MT
GreenChip SMPS control IC
Rev. 1 — 4 February 2011
Preliminary data sheet
1. General description
The TEA1733MT 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 TEA1733MT 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 TEA1733MT 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 μA)
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
1 page  
NXP Semiconductors
TEA1733MT
GreenChip SMPS control IC
7. Functional description
7.1 General control
The TEA1733MT contains a flyback circuit controller, a typical configuration of which is
shown in Figure 3.
C1
R1
C2
R2
R3 R4
Θ
Z1
TEA1733MT
VINSENSE 5
4 ISENSE
PROTECT 6
3 DRIVER
R5
CTRL
OPTIMER
C3
7
8
2 GND
1 VCC
C4 R8
C5
S1
R10
R6
C6
R9
Fig 3. Typical configuration
R7 001aan248
7.2 Start-up and UnderVoltage LockOut (UVLO)
Initially, the capacitor on the VCC pin is charged from the high voltage mains via resistor
R3.
If VCC is lower than Vstartup, the IC current consumption is low (typically 10 μA). When VCC
reaches Vstartup the IC first waits for pin VINSENSE to reach the Vstart(VINSENSE) voltage
and for pin PROTECT to reach the Vdet(L)(PROTECT) voltage. When both levels are
reached, the IC charges the ISENSE pin to the Vstart(soft) level and 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 stops switching. Depending on the protection
triggered, the protection causes a restart or latches the converter to an off-state.
A restart caused by a protection rapidly charges the OPTIMER pin to 4.5 V (typical). The
TEA1733MT enters the Power-down mode until the OPTIMER pin discharges down to
1.2 V (typical). In Power-down mode, the IC consumes a very low supply current
(10 μA typical) and the VCC pin is clamped at 22 V (typical) by an internal clamp circuit.
When the voltage on pin OPTIMER drops below 1.2 V (typical) and the VCC pin voltage is
above the VCC start-up voltage (See Figure 4), the IC restarts.
When a latched protection is triggered, the TEA1733MT immediately enters Power-down
mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage
(Vrst(latch) + 1 V).
TEA1733MT
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 4 February 2011
© NXP B.V. 2011. All rights reserved.
5 of 20
5 Page 
NXP Semiconductors
TEA1733MT
GreenChip SMPS control IC
8. Limiting values
Table 3. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Voltages
VCC supply voltage
continuous
t < 100 ms
−0.4
-
VVINSENSE
VPROTECT
VCTRL
VIO(OPTIMER)
voltage on pin VINSENSE current limited
voltage on pin PROTECT current limited
voltage on pin CTRL
input/output voltage on pin
OPTIMER
−0.4
−0.4
−0.4
−0.4
VISENSE
Currents
voltage on pin ISENSE current limited
−0.4
ICC
II(VINSENSE)
supply current
input current on pin
VINSENSE
δ < 10 %
-
−1
II(PROTECT)
input current on pin
PROTECT
−1
ICTRL
IISENSE
IDRIVER
General
current on pin CTRL
current on pin ISENSE
current on pin DRIVER
δ < 10 %
−3
−10
−0.4
Ptot
Tstg
Tj
ESD
total power dissipation
storage temperature
junction temperature
Tamb < 75 °C
-
−55
−40
VESD
electrostatic discharge
voltage
class 1
human body
model
[1] -
machine model
[2] -
charged device
model
-
Max
+30
35
+5.5
+5
+5
+5
+5
0.4
+1
+1
0
+1
+1
0.5
+150
+150
4000
300
750
[1] Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
[2] Equivalent to discharging a 200 pF capacitor through a 0.75 μH coil and a 10 Ω resistor.
Unit
V
V
V
V
V
V
V
A
mA
mA
mA
mA
A
W
°C
°C
V
V
V
9. Thermal characteristics
Table 4. Thermal characteristics
Symbol Parameter
Conditions
Rth(j-a)
thermal resistance from junction to ambient in free air; JEDEC test
board
Rth(j-c)
thermal resistance from junction to case
in free air; JEDEC test
board
Typ Unit
150 K/W
79 K/W
TEA1733MT
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 4 February 2011
© NXP B.V. 2011. All rights reserved.
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