YB7002 Datasheet | YOBON TECHNOLOGIES

Photoflash Capacitor Charger with Automatic Refresh Description YB7002 charge high voltage photoflash capacitors quickly and efficiently. Designed for use in digital and film cameras, these devices use flyback topology to achieve efficiencies up to four times better than the peting flash modules. A unique peak inductor current control mechanism maintains current-limited mode transformer operation throughout the entire charge cycle, eliminating the high inrush current often found in flash modules. YB7002 output voltage sensing scheme monitors the flyback voltage to directly regulate the output voltage. This feature allows the capacitor to be held at a fully charged state without excessive power consumption. Adjustable refresh time is fully controllable by the user with a resistor. The DONE pin signals that the capacitor is full charged. Features - Charge Any Size Photoflash Capacitor - Support Operation from Two AA Cells or - - - - - - - - Any Supply from 1.8V to 16V Use Standard Transformers No High Voltage Zener Diode Required Built in 40V Output Switch Adjustable Output Voltage Adjustable Peak Switch Current Automatic Refresh with Adjustable Timer Charge plete Indicator Small 10-Lead MSOP Packages Applications - Digital Camera Flash unit - Film Camera Flash Unit - High Voltage Power Supplies Typical Application Circuit Figure 1: Typical Application Circuit YB7002 Rev.1.1 .yobon..tw 1 Photoflash Capacitor Charger with Automatic Refresh Pin Configuration PGND AGND VIN VHYST VFB 1 2 3 4 5 MSOP10 10 9 8 7 6 SW SW LIMIT DONE EN Figure 2: Pin Configuration Pin Description Table 1 Pin 1 2 3 4 5 6 7 8 9, 10 NAME PGND AGND VIN VHYST VFB EN DONE LIMIT SW Description Power Ground, tie solidly to system ground of the board. Analog Ground, tie solidly to system ground of the board. Input supply pin. Must be locally connected to bypassed capacitor to eliminate noise. Connecting a resistor RHYST from VHYST to ground will set the refresh...