công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
TEA2019 bảng dữ liệu(PDF) 5 Page - STMicroelectronics |
|
TEA2019 bảng dữ liệu(HTML) 5 Page - STMicroelectronics |
5 / 7 page • Efficient and fast switch-off When the positive base drive is removed, 1s (typically) will elapse before the application of negative current therefore allowing a safe and rapid collector current fall. Safety Functions • Overload & short-circuit protection When the voltage applied to pin 12 exceeds the current limitation thershold voltage [Vth(Ic)], the output flip-flop is reset and the transistor is turned off. The shunt resistor Re must be calculated so as to obtain the current limitation threshold on pin 12 at the maximum allowable collector current. • Demagnetization sensing This function disables any new conduction cycle of the transistor as long as the core is not com- pletely demagnetized. When not used, pin 5 must be grounded. • ton(max) Outside the regulation area and in the absence of current limitation, the maximum conduction time is set at about 70% of the period. • ton(min) A minimum conducting time is ensured during each period (see Figure 2). • Supply voltage monitoring The TEA2019 will stop operatingif VCC+on Pin 3 falls below the threshold level VCC(stop). R B R e IB I C t t I C I B 0 0 COLLECTOR CURRENT BIAS CURRENT I C I B R e R B I C t on(min) 1 12 TEA2019 Figure 2 Starting Process (Figure 3) Prior to starting, a low current is drawn from the high voltage source through a high value resistor. This current charges the power supply storage capacitor of the device. No output pulses are available before the voltage on pin 3 has reached the threshold level [VCC(start), V + CC rising]. During this time the TEA2019 draws only 1mA (typically). When the voltage on pin 3 reaches this threshold base drive pulses appear. The energy drawn by these pulses tends to dis- charge the power supply storage capacitor. How- ever a hysteresis of about 1.1V (typically) ( ∆ VCC) is implemented to avoid the device from stopping. V CC (start) CC (stop) V V CC V CC 6V 4.9V t Figure 3 : Normal TEA2019 Start up Sequence TEA2019 5/7 |
Số phần tương tự - TEA2019 |
|
Mô tả tương tự - TEA2019 |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất 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 |