NXP GreenChip flyback controllers TEA173x Bring high efficiency and low standby power to low-cost applications Optimized for applications requiring up to 75 W, these cost-effective devices deliver 90% efficiency, use <100 mW of power, and enable slim, compact designs. Key features (TEA1733, TEA1738) `` SMPS controller IC enabling low-cost applications `` Large input voltage range (12 to 30 V) `` Very low supply current during start-up and restart ` (10 μA typ) `` Low supply current during normal operation ` (0.5 mA typ without load) `` Overpower or high/low line compensation `` Adjustable overpower time-out & restart timer `` Reduced EMI `` High efficiency at low output power levels `` Slope compensation for CCM operation `` Low and adjustable OverCurrent Protection (OCP) trip level `` Adjustable soft start operation `` Two protection inputs (e.g. for input UVP and OVP, OTP and output OVP) `` Over-temperature protection `` Low-cost, industry-standard packages Applications `` Adapters for notebooks, netbooks, printers `` LCD monitors `` DCM and CCM power supplies Additional features (TEA1738) `` Higher efficiency at medium and low loads `` Higher frequency at overpower `` VCC over-voltage protection `` Pin-for-pin compatible with TEA1733 in SO8 package All the TEA1733 and TEA1738 variants are produced in NXP’s ABCD silicon-on-insulator (SoI) technology. As a result, the devices offer high-speed protection, are insensitive to ` latch-up, and are less dependent on temperature. NXP’s GreenChip TEA1733 and TEA1738 devices combine fixed-frequency operation at high output power with frequency reduction at low output power. The result is high efficiency over the total load range. Frequency jitter reduces electromagnetic interference (EMI), and both ICs are equipped with several protections to enhance robustness and reliability. The standard versions of the TEA1733 and TEA1738 operate at 67 kHz and cause safe restart for over-power time-outs. The TEA1733L and TEA1738L versions trigger latched protection for over-power time-outs. The TEA1733 is also available in derivatives that operate at 90 kHz: the TEA1733A includes safe restart, the TEA1733M offers latched protection. Signal interference is also lower, and a wider VCC range is possible. For both devices, during startup, the supply voltage VCC is charged by the current through a start-up resistor. Since the current consumption of the IC is roughly 10 µA (typ) at startup, there’s no need for high-voltage circuitry. Low current consumption and frequency reduction means that a standby power of less than 100 mW is possible. With the right external resistors and X-cap, the measured standby power can be as low as 48 mW at 115 Vac and 84 mW at ` 230 Vac for a typical 65 W, 19.5 V power supply. Both devices offer a number of protection features, including input and output over/under-voltage protection, over-power protection, and internal/external over-temperature protection. The devices are adjustable for over-power time-out, and the support high/low line compensation. TEA1733(L) vs. TEA1738(L) Designed as a drop-in replacement for the TEA1733(L), the TEA1738(L) uses the same low-cost, industry-standard SO8 package and has the same pinning, but delivers even higher efficiency. TEA1733 block diagram The TEA1738(L) uses a lower frequency at medium loads to obtain higher efficiency at medium and low loads. It uses a higher frequency during overpower conditions to obtain a temporary increase in output power. The frequency reduction slope (Vco mode) has been changed to prevent audible noise and achieve the lowest possible standby power. The VINSENSE high-protection function has been removed, to reduce reset time after an overvoltage condition. The maximum duty cycle has been increased, to support larger dips in mains voltage. Over-voltage protection has been added to the VCC line, to improve the accuracy of internal protection. In the L version, which offers latched protection, there are new techniques for preventing false OPP triggering and for preventing latched protection reset due to premature VCC UVLO. Note that replacing the TEA1733(L) with the TEA1738(L) may impact EMI and protection behavior. An application check is recommended before finalizing any replacements. Adapter demo board The NXP demo board UM10385 gives an example of a 65 W notebook adapter. The TEA1733 helps the system achieve an EnergySTAR average efficiency of roughly 90% at ` 115 and 230 Vac. The board also features extremely low power consumption at no load (115 V = <60 mW at no load, ` 230 V = <100 mW at no load). TEA1738 application diagram TEA173x versions Parameter TEA1733 TEA1733L TEA1738 TEA1738L Safe restart protection Yes TEA1733M Yes Latched protection Yes SO8 package Yes Yes Yes Yes Yes 90 kHz 90 kHz Yes (TEA1733L only) DIP8 package Operating frequency TEA1733A 67 kHz 67 kHz TEA173x protection parameters Parameter Protection TEA1733 TEA1733L TEA1733A TEA1733M TEA1738 TEA1738L Cycle by Cycle Cycle by Cycle Cycle by Cycle Cycle by Cycle Cycle by Cycle Cycle by Cycle OVP` (Over Voltage Protection, supply pin Vcc) external external external external integrated integrated pin PROTECT, level > Vhigh (PROTECT) (typ. 0.8 V) Latched Latched Latched Latched Latched Latched pin PROTECT, level < Vlow (PROTECT) ` (typ. 0.5 V) Latched Latched Latched Latched Latched Latched pin OPTIMER, VOPTIMER (prot) ` voltage > 2.5 V (typ.) Safe Restart Latched Safe Restart Latched Safe Restart Latched IC Over Temperature Protection (OTP) Latched Latched Latched Latched Latched Latched pin VINSENSE, level < Vlow (VINSENSE) (typ. 0.69 V) Safe Restart Safe Restart Safe Restart Safe Restart Safe Restart Safe Restart pin VINSENSE, level > Vhigh (VINSENSE) (typ.3.5 V) Safe Restart Safe Restart Safe Restart Safe Restart Not Implemented Not Implemented OCP` (Over Current Protection, primary side) www.nxp.com © 2011 NXP Semiconductors N.V. All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The Date of release: February 2011 information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and Document order number: 9397 750 17052 may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. 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