Datasheet TCR5RG (Toshiba) - 8

TCR5RG series 9.3. Attention in Use
● Output Capacitors Toshiba recommends to use ceramic capacitors for these devices. However, because of the type of the capacitors, there might be greatly affected by thermal features and DC bias depending. Please secure an ef ective capacitance of 0.6 μF or more by considering application condition for selecting capacitors. ● Mounting The long distance between IC and output capacitor might affect phase assurance by impedance in wire and inductor. For stable power supply, output capacitor need to mount near IC as much as possible. Also VIN and GND pattern need to be large and make the wire impedance small as possible. ● Permissible Loss Please have enough design patterns for expected maximum permissible loss. And under consideration of surrounding temperature, input voltage, and output current etc., we recommend proper dissipation ratings for maximum permissible loss; in general maximum dissipation rating is 70 to 80 %. ● Over current Protection and Thermal shut down function Over current protection and Thermal shut down function are designed in these products, but these are not designed to constantly ensure the suppression of the device within operation limits. Depending on the condition during actual usage, it could affect the electrical characteristic specification and reliability. Also note that if output pins and GND pins are not completely shorted out, these products might be break down. When using these products, please read through and understand the concept of dissipation for absolute maximum ratings from the above mention or our ‘Semiconductor Reliability Handbook’. Then use these products under absolute maximum ratings in any condition. Furthermore, Toshiba recommend inserting failsafe system into the design. ● High ripple rejection ratio and low output noise voltage characteristics TCR5RG series has low-pass filter which contributes high ripple rejection ratio and low output noise voltage. This low-pass filter turns on about 2ms after VOUT becomes near the nominal VOUT. Therefore, before and when the low-pass filter is turned on, please be careful about the increase and decrease of VOUT such as CONTROL voltage from low to high and road transient response. © 2020 2020-12-18 Toshiba Electronic Devices & Storage Corporation