TEA1738T Datasheet PDF - NXP Semiconductors
Part Number | TEA1738T | |
Description | GreenChip SMPS control IC | |
Manufacturers | NXP Semiconductors | |
Logo | ||
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Preview 1 page No Preview Available ! TEA1738T; TEA1738LT
GreenChip SMPS control IC
Rev. 2 — 14 January 2011
Product data sheet
1. General description
The TEA1738(L) is a low cost Switched Mode Power Supply (SMPS) controller IC
intended for flyback topologies. The TEA1738(L) operates in peak current and frequency
control mode. Frequency jitter has been implemented to reduce ElectroMagnetic
Interference (EMI). Slope compensation is integrated for Continuous Conduction Mode
(CCM) operation.
The TEA1738(L) 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), output OverVoltage Protection (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 TEA1738(L) 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)
Integrated OverVoltage Protection (OVP) on pin VCC
Very low supply current during start-up and restart (10 μA typical)
Low supply current during normal operation (0.55 mA typical 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 at medium power operation to maintain high efficiency
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NXP Semiconductors
TEA1738T; TEA1738LT
GreenChip SMPS control IC
7. Functional description
7.1 General control
The TEA1738(L) contains a flyback circuit controller, a typical configuration of which is
shown in Figure 3.
D1
R3
C1
C2
R1
R2
R4
Θ
O1
VINSENSE 5
4 ISENSE
PROTECT
CTRL
OPTIMER
6 TEA1738T 3 DRIVER
7 TEA1738LT 2 GND
8 1 VCC
C4 R8
C5
Fig 3. Typical configuration
T1
S1
R10
R6
C6
D3
C7
Z1
O1
R9
D2
001aan169
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 (10 μA typical). 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 it either 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
TEA1738(L) 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 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 TEA1738(L) immediately enters Power-down
mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage
(Vrst(latch) + 1 V).
TEA1738T_TEA1738LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 14 January 2011
© NXP B.V. 2011. All rights reserved.
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