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NCP5080 Datasheet(PDF) 6 Page - ON Semiconductor |
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NCP5080 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 12 page NCP5080 http://onsemi.com 6 supply a regulated 300 V across the external reservoir capacitor. Note that although an OVP circuit is built-in the NCP5080 chip, it is strongly recommended to avoid operation without an external reservoir capacitor, a 1 mF / 315 V being the minimum value. When the NMOS is ON, the current increases into the primary of the transformer until either the Ipeak limit has been reached, or the time out is finished: at this point, the NMOS is switched OFF and the energy stored into the primary is dumped to the secondary, providing the current to recharge the reservoir capacitor. The OFF period is monitored by sensing the primary voltage and the system will re-start a new cycle when either Vp = 0 V or the time out is finished. The external resistor divider, connected across Vout and Ground, senses the output voltage to close the feedback loop at FBD pin. The output voltage is based on the 1.2 V reference and the R1/R2 ratio: Vout = VREF * ((R1 + R2) / R2). The output voltage is regulated when the EN = H, but drops to zero when EN = L. In this case, the discharge time of the external reservoir depends solely upon the value of the passive component and the leakage currents that might exist at system level. The DC/DC converter is switched OFF when either EN = Low, or TRGFL = High, or when the output voltage has reached the programmed value (see Figure 3). Inductor Peak Current In order to provide more flexibility to the NCP5080 driver, an extra pin, IPKREF, is provided to set up the peak current flowing into the primary inductor of the transformer. The IREF is given by the 1.14 V voltage reference and the value of the external resistor: I REF + 1.14 V RIPK (eq. 1) The primary peak current is given by Equation 1: I peak + IREF * 14000 (eq. 2) The maximum Ipeak current shall be limited to 1.5 A maximum, assuming the transformer is sized to sustain such amount of electromagnetic energy. The efficiency of the DC/DC converter, and the recharge cycle time as well, depends upon the ESR and leakage inductance of the power transformer: a poor transformer will generate large oscillations during the operation which will be difficult to filter out at PCB level. Table 1. PREFERRED POWER TRANSFORMER MANUFACTURERS Manufacturer Model Comments TDK LDT565620ST-20 3 Ipeak = 750 mA Max Coilcraft CJ5143-AL Ipeak = 1200 mA Max Table 2. PREFERRED HIGH VOLTAGE TRIGGER FUNCTION Component Manufacturer Model Comments High Voltage Trigger PCA EPC3215G-X Vout = 4000 V High Voltage Ceramic Capacitor TDK C3225X7R2J473M Reference design+ 22 mF/330 V to 120 mF/330 V RUBYCON FW series Preferred Table 3. PREFERRED XENON LAMP Component Manufacturer Model Comments Flash Lamp-Reflector Assembly Perkin-Elmer RF-ASYRF160709 PKI08 (H) Ej = 1.5 Joule Cout = 33 mF Flash Lamp-Reflector Assembly Perkin-Elmer RF-ASY RF160709 PKI07 (H) Ej = 2.1 Joule Cout = 47 mF Flash Lamp-Reflector Assembly Nam Kwong Co. LTD. FET-O-D03150220E-02 9.8 Joule, Cout = 180 mF Flash Lamp-Reflector Assembly Nam Kwong Co. LTD. FET-O-D02230202A-07 8.0 Joule, Cout = 150 mF Perkin Elmer coordinates: kimguan.lim@perkinelmer.com Flash Strobe The flash is activated by the digital status present at the TRGFL Pin and the logic condition of the EN and PHSEN Pins as defined in Table 4. |
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