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TEA1501 Datasheet(PDF) 8 Page - NXP Semiconductors |
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TEA1501 Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 20 page  1998 Aug 19 8 Philips Semiconductors Preliminary specification Greeny; GreenChip ™ TEA1501 Burst oscillator The burst oscillator generates a triangular wave signal for determination of the burst frequency. The burst frequency is determined accurately and temperature independent by the externally connected reference resistor RRef and burst capacitor CBt. Gate driver The gate driver switches the power switch. The power switch is turned on at the beginning of every oscillator cycle and is turned off by the primary current comparator or by the maximum on-time. The power switch is also prevented from turning on if the Vaux voltage has reached its regulation level or in case of active over temperature protection or in case of active under voltage lockout protection. Power switch The power switch is an integrated high voltage LDMOST with a Rdson of 40 Ω, a maximum peak drain voltage of 650 V , a maximum continuous drain voltage of 500 V and a maximum drain current of 0.25 A. Primary current comparator The primary current comparator senses the voltage across the external sense resistor RSrc which reflects the primary current. The detection level of the comparator is 0.5 V. The power switch is switched off quickly when the source voltage exceeds this detection level. The comparator has a typical propagation delay of 80 ns. If the dV/dt of the drain voltage has to be limited for EMI reasons, a capacitor can be connected between the Drn and Src pins of Greeny. The discharge current of this EMI capacitor does not flow through the sense resistor RSrc and does not activate the comparator. Leading edge blanking To prevent the power switch from switching off due to the discharge current of the capacitance on the Drn pin a Leading Edge Blanking (LEB) circuit has been implemented. The leading edge blanking time is defined as the maximum duration time needed to discharge the capacitance at the drain of the power switch. The leading edge blanking time is determined by the reference resistor to obtain an accurate and temperature independent time. The LEB time tracks with the period time of the switch oscillator. Modulator The modulator determines the regulation level of the Vaux voltage. For a burst duty cycle from 0 to 40% the Vaux voltage is regulated to 20 V. For stable operation in burst mode a decrease in regulation voltage is integrated for a burst duty cycle above 40%. At 100% burst duty cycle the regulation voltage is 17.5 V. Counter The power delivered to the load (auxiliary and secondary) is a function of the number of energy pulses per burst, according to the following formula: Where η is the efficiency, L p is the primary inductance, Iprim is the primary peak current, fburst is the burst frequency and N is the number of pulses in one burst period. The counter counts the number of pulses in each burst period and detects if the Ndata threshold is passed. The counter state is used for the data transfer function and for the supply current tracking. Fig.6 Regulation level VVaux versus burst duty cycle. handbook, halfpage MGM826 regulation level Vaux (V) SVaux 17.5 20 0 0 40 CPVaux burst duty cycle (%) 100 P load η 1 2 --- L p I prim 2 f burst N × × × × × = |
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Similar Description - TEA1501 |
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