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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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WY0222MCMBF0K bảng dữ liệu(PDF) 9 Page - International Rectifier |
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WY0222MCMBF0K bảng dữ liệu(HTML) 9 Page - International Rectifier |
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9 / 30 page  www.irf.com - 9 - the buck high-side and full-bridge high and low-side output drivers are activated. The low voltage power supply is realized with buck converter circuit utilizing the Link Switch LNK302D (Figure 4.1). Once the voltage on VCC reaches the start-up threshold (UVLO+), voltage on VSENSE pin is above VOV threshold and the voltage on RST pin is less than 1.5V, the IC turns on and the full-bridge oscillator (CT) and gate driver outputs (HO1, LO1, HO2 and LO2) begin to oscillate. During UVLO mode, the full-bridge and buck are off, the ignition timer and clock are off, the fault and good counters are reset, and the fault latch is reset. 5.3 Ignition Mode The ignition timer is enabled when the IC first enters IGN Mode. The ignition timer frequency is programmed with the external capacitor at the TIGN pin. CTIGN charges up and down linearly through internal sink and source currents between a fixed voltage window of 2V and 4V (Figure 5.3). This sets up an internal clock (666ms typical) that is divided out 128 times and then used to turn the ignition gate driver output (IGN pin) on and off for a given on and off- time (21sec ‘high’/64sec ‘low’ typical). A logic ‘high’ at the IGN pin will turn the external ignition MOSFET (MIGN) on and enable the external sidac- controlled pulse ignition circuit. TIGN IGN VLAMP 4V 2V 0V IGN ENABLED (21s typ.) IGN DISABLED 666ms typ. (64s typ.) IGN ENABLED (21s typ.) FAULT MODE 787sec typ. Figure 5.3: Ignition Timer Timing Diagram During the ignition phase, the lamp is an open circuit and the buck output voltage is limited to a maximum value. The ignition circuit comprises of a diac (DIGN), transformer 1180sec typ. |
Số phần tương tự - WY0222MCMBF0K |
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Mô tả tương tự - WY0222MCMBF0K |
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