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LM236BZ bảng dữ liệu(PDF) 4 Page - STMicroelectronics |
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4 / 10 page LM236 - LM336,B 4/10 APPLICATION HINTS The LM236, LM336 voltage references are easier to use than zener diodes. Their low impedance and wide current range facilitate biasing in any cir- cuits. Besides, the breakdown voltage or the tem- perature coefficient can be adjusted so as to opti- mize the performance of the circuit. Figure 1 represents a LM336 with a 10k Ω potenti- ometer to adjust the reverse breakdown voltage which can be adjusted without altering the temper- ature coefficient of the circuit. The adjustment range is generally sufficient to adjust the initial tol- erance of the circuit and the inaccuracy of the am- plifier circuit. To obtain a lower temperature coefficient two di- odes can be connected in series as indicated in Figure 2. When the circuit is adjusted to 2.49V the tempera- ture coefficient is minimized. For a correct temperature coefficient, the diodes should be at the same ambient temperature as the LM336. The value of R1 is not critical (2-20k Ω). |
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