TinySwitch single-chip switching power supply design method

The integrated chip TinySwitch for small power switching power supply uses built-in chip power supply, no auxiliary power supply; window comparison method replaces the error amplifier and PWM of TOP-Switch chip, which improves the response speed of the circuit; Current limiting mode: The "jump cycle" mode of operation makes the switching loss and the load g-ratio by changing the effective working frequency. The power supply has extremely high efficiency; the over-temperature blocking function with built-in overheat protection ensures the safe operation of the switch.

Therefore, the switching power supply fabricated by TinySwitch has the advantages of simple circuit, small component count, and low performance cost. It is the best choice for isolated switching power supplies below 10W.

2 Switching Power Supply Design Method (TNY253) The typical circuit of the switching power supply is shown.

Calculate the minimum reflected voltage VorJ) Use Vor to design the intermittent operation mode, if necessary, increase the VorJ) When V=150V, select the larger TinySwitch to ensure the operation in the intermittent operation mode; 4) Select the appropriate ferrite magnet Core design transformer; 5) Select feedback circuit and its components.

The specific design steps are as follows: Determine the system requirements: Under the general input condition, the AC input voltage limit value AC bus frequency fL=50 Hz; output voltage V., output power P and efficiency n. Select the output diode. The output diode is selected based on the desired power supply efficiency and cost. 1) For power supplies with an output voltage lower than 7.5V, the Schottky diode can be used to output the maximum peak reverse voltage of the diode: PIV=0.8xVH, where VR is the output diode breakdown voltage value, and the Schottky diode VR is 40. -45V, ultra-fast diode VR*100-200V, fast diode VR is greater than 200V. Reflected output voltage VorS: If Vor is greater than 150V, return to step 2 to select 篼VR diode.

According to the input voltage range and output power, choose TinySwitch. Under the normal input voltage, TNY254 should be selected for 1-1.5W output power, and TNY255 should be selected for 3.5-4W output power. Determine the transformer primary current maximum Ip calculation The maximum duty cycle primary peak current in continuous mode is the product of the thermal derating factor of 0.9 and the minimum current Iuurr of the selected TinySwitch data card. IpsOSxminluMrr. Calculate the switch off time and reset time ratio Kp: Verify that Kdp meets intermittent operation. Mode, otherwise, the Vr value must be increased.

The operating mode is determined according to the requirements of the power supply, and is generally operated in an intermittent state as much as possible. Because the output filter can use PN junction diodes at this time, the volume is small, which can reduce the cost of the filter, output ripple and electromagnetic interference. The use of the RC snubber circuit and the PN junction diode is required to operate in the full discontinuous mode, and the sputum V is kept below 150V, so that the drain voltage can be guaranteed to be lower than the telephone: 010~62559461, 62545262 (Fax). The thesis received the attention of academicians of the two academies. The recommended value of CMOS is 650V. The basic intermittent operation state (Kp>l) means that it runs in discontinuous mode in most cases and occasionally runs in continuous mode.

If running in continuous mode (Kcp<1), a Schottky diode must be used as the output capacitor to reduce excessively long reverse recovery time.

17. Calculate the transformer. The ratio is: i. According to different needs, it is the completely intermittent operation mode, go to step bookmark4 to select the appropriate core.

3000 Gauss. Primary turns: where IP calculates the primary and secondary coil turns to ensure that the maximum magnetic density is less than 16A; otherwise, it determines if it needs to operate in full discontinuity mode. If necessary, let 150V go to step 16A. If Vr>150V, go back to step 7 and select the more compact TinySwitch. If you don't need to run in full interrupt mode, go to the next step.

11. If the check is more than 1, run in basic discontinuous mode, go to 16A, otherwise, go to the next step.

Secondary turns: Ns = air gap length: 0.1 mm.

18. Calculate the primary and secondary current rms values.

Primary current rms value in discontinuous mode: 12. Determine if the continuous operation mode meets the design requirements. If yes, go to the next step, otherwise, make =1, recalculate =, if V8 < 150V, go to step 16A, if VoMOV, go back to step 7 and select the more timid TinySwitch. 13. Recalculate the continuous operation mode The maximum duty cycle, =TZfr~, starts the design of the continuous mode. M"v 14. Calculate the ratio of the primary ripple current to the primary peak current. According to: Calculate the ratio = secondary current RMS: the formula of the step and Vr. If VoMOV, enter 16B, otherwise return to step 7 to select the more ambiguous TinySwitch. Intermittent mode: ~continuous mode: ~ where Ip is the value of step 8, fS is the switching frequency value in the given data of TinySwitch, Z is the loss distribution coefficient. When Z=0, all losses are in the primary, Z= At 1 o'clock, all losses are in the secondary.

19. Determine the output short circuit current. /OT=/fxix/t, where k is the conversion factor between the current maximum and the effective value, Schottky diode: k = 0.9, PN junction diode: k = 0.8. Verify that Ics should be less than the diode DC current rating, Otherwise, the diode with a high rated current should be reselected. / 20. Determine the output capacitor CtT. Calculate the output ripple current: 7 view a C select the output capacitor so that its RMS current rating is not lower than I%. 21. Determine the feedback loop and output filter. The output voltage must be sensed after the first stage output capacitor and before the output filter LC. This allows the output filter LC to be outside the feedback loop, and the LC oscillation frequency can be lower to meet the special requirements of the output ripple.

The Zener diode series optocoupler LED is used to form a feedback circuit, and the output voltage is VVz+VuVulV. For more accurate output, TL431 is used instead of Zener diode.

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Communication: 100080 Beijing 8712 box microcomputer suffocation editorial department - 72 yuan / year post office subscription number: 82-946 The application of TinySwitch switching power supply has the advantages of simple circuit, small size, small component count, strong performance and low cost. The basic design method of TinySwitch single-chip switching power supply introduced in this paper has the advantages of simple and easy, economical and efficient, and has a certain guiding role for power supply designers.

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