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TEA1733P
Low voltage start-up flyback controller suitable for fixed frequency/CCM
1. General description
The TEA1733P is a low cost Switched Mode Power Supply (SMPS) controller IC intended
for flyback topologies. It operates in fixed frequency mode. To reduce ElectroMagnetic
Interference (EMI), frequency jitter has been implemented. Slope compensation is
integrated for Continuous Conduction Mode (CCM) operation.
The TEA1733P 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 TEA1733P 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 30V) Very low supply current during start-up and restart (typically 10 A) Low supply current during normal operation (typically 0.5 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
TEA1733P
GreenChip SMPS control IC
Rev. 7 — 15 July 2013 Product data sheet
NXP Semiconductors TEA1733P
GreenChip SMPS control IC Adjustable soft start operation Two protection inputs (e.g. for input UVP and OVP, OTP and output OVP) IC overtemperature protection
3. Applications All applications requiring efficient and cost-effective power supply solutions up to W. Ordering informationTable 1. Ordering information
TEA1733P DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
5. Block diagram
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
6. Pinning information
6.1 Pinning
6.2 Pin description
Table 2. Pin description
VCC 1 supply voltage
GND 2 ground
DRIVER 3 gate driver output
ISENSE 4 current sense input
VINSENSE 5 input voltage protection input
PROTECT 6 general purpose protection input
CTRL 7 control input
OPTIMER 8 overpower and restart timer
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
7. Functional description
7.1 General control
The TEA1733P contains a flyback circuit controller, a typical configuration of which is
shown in Figure3.
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 A). When VCC
reaches Vstartup, the IC first waits for the VINSENSE pin to reach the Vstart(VINSENSE)
voltage and PROTECT pin 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
TEA1733P enters Power-down mode until the OPTIMER pin discharges down to 1.2V
(typical). In Power-down mode, the IC consumes a very low supply current (10 Atypical)
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 TEA1733P immediately enters Power-down
mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage
(Vrst(latch) +1V).
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
When the voltage on pin VCC drops below the Vth(UVLO) level during normal operation, the
controller stops switching and enters Restart mode. In Restart mode, the driver output is
disabled and the VCC pin voltage is recharged via resistor R3 to the rectified mains.
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 Input voltage detection (VINSENSE pin)
In a typical application the mains input voltage can be detected by the VINSENSE pin.
Switching will not take place until the voltage on VINSENSE has reached the
Vstart(VINSENSE) voltage (typically 0.94 V).
When the VINSENSE voltage drops below Vdet(L)(VINSENSE) (typically 0.72 V) or exceeds
Vdet(H)(VINSENSE) (typically 3.52 V), the converter stops switching and performs a restart.
If pin VINSENSE is left open or disconnected, the pin is pulled up by the internal 20 nA
(typical) current source to reach the Vdet(H)(VINSENSE) level. This triggers restart protection.
An internal clamp of 5.2 V (typical) protects this pin from overvoltages. V) or below Vdet(L)(PROTECT) (typically 0.5 V). A A (typical) flows into the chip when the pin voltage
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
The PROTECT input can be used to create overvoltage detection and OTP functions.
A small capacitor can be connected to the pin if the protections on this pin are not used.
An internal clamp of 4.1 V (typical) protects this pin from overvoltages.
7.6 Duty cycle control (CTRL pin)
The output power of the converter is regulated by the CTRL pin. This pin is connected to
an internal 5.4 V supply using an internal 7 k resistor.
The CTRL pin voltage sets the peak current which is measured using the ISENSE pin
(see Section 7.10). At a low output power the switching frequency is also reduced (see
Section 7.12). The maximum duty cycle is limited to 72 % (typical).
7.7 Slope compensation (CTRL pin)
A slope compensation circuit is integrated in the IC for CCM. Slope compensation
guarantees stable operation for duty cycles greater than 50%.
7.8 Overpower timer (OPTIMER pin)
If the OPTIMER pin is connected to capacitor C4 (see Figure 3), a temporary overload
situation is allowed. Vctrl(Ipeak) (see Figure 1) is set by the CTRL. When Vctrl(Ipeak) is above
400 mV, the IIO(OPTIMER) current (11A typical) is sourced from the OPTIMER pin. If the
voltage on the OPTIMER pin reaches the Vprot(OPTIMER) voltage (2.5 V typical) the
OverPower Protection (OPP) is triggered (see Figure 5).
When the Vprot(OPTIMER) voltage is reached the device restarts. If the overload is removed
before the Vprot(OPTIMER) voltage is reached, the converter will continue switching.
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
7.9 Current mode control (ISENSE pin)
Current mode control is used for its good line regulation.
The primary current is sensed by the ISENSE pin across an external resistor R9 (see
Figure 3) and compared with an internal reference voltage. The internal reference voltage
is proportional to the CTRL pin voltage (see Figure 6).
Leading edge blanking prevents false triggering due to capacitive discharge when
switching on the external power switch (see Figure 7).
7.10 Overpower or high/low line compensation
(VINSENSE and ISENSE pins)
The overpower compensation function can be used to realize a maximum output power
which is nearly constant over the full input mains.
The overpower compensation circuit measures the input voltage on the VINSENSE pin
and outputs a proportionally dependent current on the ISENSE pin. The DC voltage
across the soft start resistor limits the maximum peak current on the current sense
resistor.
At low output power levels the overpower compensation circuit is switched off
(See Figure8).
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
7.11 Soft start-up (ISENSE pin)
To prevent audible noise during start-up or a restart condition, a soft start is made. Before
the converter starts, the soft start capacitor C6 (see Figure 3) on the ISENSE pin is
charged. When the converter starts switching, the primary peak current slowly increases
as the soft start capacitor discharges through the soft start resistor (R6, see Figure 3).
The soft start time constant is set by the soft start capacitor value chosen. The soft start
resistor value must also be taken into account, but this value is typically defined by the
overpower compensation (see Section 7.10).
7.12 Low power operation
In low power operation switching losses are reduced by lowering the switching frequency.
The converter switching frequency is reduced and the peak current is set to 25 % of the
maximum peak current (see Figure 6 and Figure 9).
7.13 Driver (DRIVER pin)
The driver circuit to the gate of the power MOSFET has a current sourcing capability of
typically 300 mA and a current sink capability of typically 750 mA. This allows for a fast
turn-on and turn-off of the power MOSFET for efficient operation.
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
7.14 OverTemperature Protection (OTP)
Integrated overtemperature protection ensures the IC stops switching if the junction
temperature exceeds the thermal temperature shutdown limit.
OTP is a latched protection and it can be reset by removing the voltage on pin VCC.
8. Limiting values
[1] Equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor.
[2] Equivalent to discharging a 200 pF capacitor through a 0.75 H coil and a 10  resistor.
Table 3. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Voltages
VCC supply voltage continuous 0.4 +30 V< 100 ms - 35 V
VVINSENSE voltage on pin VINSENSE current limited 0.4 +5.5 V
VPROTECT voltage on pin PROTECT current limited 0.4 +5 V
VCTRL voltage on pin CTRL 0.4 +5.5 V
VIO(OPTIMER) input/output voltage on pin
OPTIMER 0.4 +5 V
VISENSE voltage on pin ISENSE current limited 0.4 +5 V
Currents
ICC current on pin VCC  <10% - +0.4 A
II(VINSENSE) input current on pin VINSENSE 1+1 mA
II(PROTECT) input current on pin
PROTECT 1+1 mA
ICTRL current on pin CTRL 30 mA
IISENSE current on pin ISENSE 10 +1 mA
IDRIVER current on pin DRIVER  <10% 0.4 +1 A
General
Ptot total power dissipation Tamb <75 C- 0.5 W
Tstg storage temperature 55 +150 C junction temperature 40 +150 C
ESD
VESD electrostatic discharge
voltage
class1
human body
model
[1] -4000 V
machine model [2] -300 V
charged device
model
-750 V
NXP Semiconductors TEA1733P
GreenChip SMPS control IC
9. Thermal characteristics Table 4. Thermal characteristics
Rth(j-a) thermal resistance from
junction to ambient
in free air; JEDEC test
board
150 K/W
Rth(j-c) thermal resistance from
junction to case
in free air; JEDEC test
board K/W

Partno	Mfg	Dc	Qty	Available	Descript
TEA1733P	NXP	N/a	24	avai	Low voltage start-up flyback controller suitable for fixed frequency/CCM