Document
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
NXP Semiconductors
TEA1733MT
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 75 W.
4. Ordering information
Table 1. Ordering information
Type number
Package
Name
Description
TEA1733MT
SO8
plastic small outline package; 8 leads; body width 3.9 mm
Version SOT96-1
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.
2 of 20
NXP Semiconductors
5. Block diagram
TEA1733MT
GreenChip SMPS control IC
1 VCC
22 V
2 GND
clamp
clamp
power down
21 V
VCCstart Vctrl(Ipeak) 400 mV
12 V
VCCstop
6V
DQ driver
overpower
2.5 V
latch 5 V restart
latch reset
OPP switch
TEMPERATURE PROTECTION
OTP
RESTART CONTROL
OPP switch 107 μA
set δmax
OSCILLATOR
frequency reduction
OPTIMER
1.2 V / 4.5 V
Vctrl(Ipeak)
ANALOG CONTROL
MODULATION
SLOPE COMPENSATION
11 μA
8 OPTIMER
5.4 V
7 kΩ 7
CTRL
DRIVER
DRV 3
S Q
R
set
stop δmax
ISENSE
55 μA
4
BLANK
soft start LEB
restart
Vctrl(Ipeak)
OVERPOWER CORRECTION
OCP soft start
VINSENSE
stop
latch
overload
VCCstop
QS overpower R
driver stop
δ max prot COUNT δ max TO 8
restart S
Q R
latch S
Q
δ max prot highvin lowvin
VCCstart power down lowvin protlow OTP prothigh protlow
overload
R latch reset
DIGITAL CONTROL
prothigh protlow highvin lowvin
0.50 V/0.80 V
32 μA
6
107 μA
PROTECT
3.52 V
0.72 V/0.94 V
5 VINSENSE
Fig 1. Block diagram
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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.
3 of 20
NXP Semiconductors
6. Pinning information
6.1 Pinning
TEA1733MT
GreenChip SMPS control IC
VCC 1 GND 2 DRIVER 3 ISENSE 4
8 OPTIMER
7 CTRL TEA1733MT
6 PROTECT
5 VINSENSE
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Fig 2. Pinning diagram SOT96-1 (SO8)
6.2 Pin description
Table 2. Pin description
Symbol
Pin
VCC
1
GND
2
DRIVER
3
ISENSE
4
VINSENSE
5
PROTECT
6
CTRL
7
OPTIMER
8
Description supply voltage ground gate driver output current sense input input voltage protection input general purpose protection input control input overpower and restart timer
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.
4 of 20
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 Und.