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PDF TEA1733CT Data sheet ( Hoja de datos )

Número de pieza TEA1733CT
Descripción GreenChip SMPS control IC
Fabricantes NXP Semiconductors 
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TEA1733CT
GreenChip SMPS control IC
Rev. 2 — 16 July 2013
Product data sheet
1. General description
The TEA1733CT 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 TEA1733CT 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 TEA1733CT 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 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

1 page




TEA1733CT pdf
NXP Semiconductors
TEA1733CT
GreenChip SMPS control IC
7. Functional description
7.1 General control
The TEA1733CT contains a flyback circuit controller, a typical configuration of which is
shown in Figure 3.
C1
R1
C2
R2
R3 R4
Z1
TEA1733CT
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 aaa-001531
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 auxiliary winding of the transformer takes over the supply voltage.
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
TEA1733CT enters 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 A 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 TEA1733CT immediately enters Power-down
mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage
(Vrst(latch) + 1 V).
TEA1733CT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 16 July 2013
© NXP B.V. 2013. All rights reserved.
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TEA1733CT arduino
NXP Semiconductors
TEA1733CT
GreenChip SMPS control IC
9. Thermal characteristics
Table 4.
Symbol
Rth(j-a)
Rth(j-c)
Thermal characteristics
Parameter
thermal resistance from
junction to ambient
thermal resistance from
junction to case
Conditions
in free air; JEDEC test
board
in free air; JEDEC test
board
Typ Unit
150 K/W
79 K/W
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
18.6 20.6
11.2 12.2
22.6 V
13.2 V
Vclamp(VCC)
clamp voltage on pin
VCC
activated during restart
activated during latched
protection
-
-
Vstartup + 1 -
Vrst(latch) + 1 -
V
V
Vhys
ICC(startup)
ICC(oper)
hysteresis voltage
start-up supply current
operating supply current
Vstartup Vth(UVLO)
VCC < Vstartup
no load on pin DRIVER;
excluding opto current
89
5 10
0.4 0.5
10 V
15 A
0.6 mA
Vrst(latch)
latched reset voltage
Input voltage sensing (pin VINSENSE)
45
6V
Vstart(VINSENSE)
start voltage on pin
VINSENSE
detection level
0.89 0.94
0.99 V
Vdet(L)(VINSENSE)
LOW-level detection
voltage on pin
VINSENSE
0.68 0.72
0.76 V
Vdet(H)(VINSENSE)
HIGH-level detection
voltage on pin
VINSENSE
3.39 3.52
3.65 V
IO(VINSENSE)
output current on pin
VINSENSE
- 20 - nA
Vclamp(VINSENSE) clamp voltage on pin
VINSENSE
II(VINSENSE) = 50 A
- 5.2 - V
Protection input (pin PROTECT)
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
TEA1733CT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 16 July 2013
© NXP B.V. 2013. All rights reserved.
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