поискавой системы для электроныых деталей |
|
TEA152X датащи(PDF) 7 Page - NXP Semiconductors |
|
TEA152X датащи(HTML) 7 Page - NXP Semiconductors |
7 / 17 page TEA152X_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 23 March 2009 7 of 17 NXP Semiconductors TEA152x SMPS ICs for low-power systems Figure 5 shows a typical curve for a reflected output voltage N × V o of 80 V. This voltage is the output voltage Vo (see Figure 6) transferred to the primary side of the transformer with the factor N (determined by the turns ratio of the transformer). Figure 5 shows that the system switches exactly at minimum drain voltage for ringing frequencies of 480 kHz, thus reducing the switch-on losses to a minimum. At 200 kHz, the next primary stroke is started at 33 ° before the valley. The switch-on losses are still reduced significantly. 8.5 Demagnetization The system operates in discontinuous conduction mode all the time. As long as the secondary stroke has not ended, the oscillator will not start a new primary stroke. During the first tsuppr seconds, demagnetization recognition is suppressed. This suppression may be necessary in applications where the transformer has a large leakage inductance and at low output voltages. 8.6 Minimum and maximum duty factor The minimum duty factor of the switched mode power supply is 0 %. The maximum duty factor is set to 75 % (typical value at 100 kHz oscillation frequency). 8.7 OverCurrent Protection (OCP) The cycle-by-cycle peak drain current limit circuit uses the external source resistor RI to measure the current. The circuit is activated after the leading edge blanking time tleb. The protection circuit limits the source voltage to Vsource(max), and thus limits the primary peak current. 8.8 Short-circuit winding protection The short-circuit winding protection circuit is also activated after the leading edge blanking time. If the source voltage exceeds the short-circuit winding protection voltage Vswp, the IC stops switching. Only a power-on reset will restart normal operation. The short-circuit winding protection also protects in case of a secondary diode short circuit. Fig 5. Typical phase of drain ringing at switch-on (at N × Vo =80V) 0 200 400 800 f (kHz) phase ( °) 40 20 −20 −40 0 mgt424 600 |
Аналогичный номер детали - TEA152X |
|
Аналогичное описание - TEA152X |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |