Electronic Components Datasheet Search |
|
GPLW3V390MTRT002 Datasheet(PDF) 4 Page - Galaxy Power, Inc. |
|
GPLW3V390MTRT002 Datasheet(HTML) 4 Page - Galaxy Power, Inc. |
4 / 8 page Leo Series, Page 4 PRELIMINARY Part No. 99–001 Rev. 4.0–120902 APPLICATION NOTES Output Over Voltage Protection: The output voltage is monitored in two ways, by the microcontroller which looks at the sensed signal and a high-speed comparator that measures the power pins. The microcontroller OVP allows the OVP circuit to track the trimmed signal. However, this circuit does not allow OVP signal detection in the event the voltage sense pins are shorted together. In that case, a redundant OVP set at a fixed threshold will prevent excessive voltage. Thermal shutdown: The printed circuit board temperature is measured using a semiconductor sensor. If the maximum rated temperature is exceeded, the converter is shutdown until the temperature decreases to 90 degC. The time for this depends on the airflow and heatsink mass. Please consult Galaxy Power for your special needs. Remote Sense: The output voltage is regulated at the point where the sense pins connect to the power output pins. Total sense compensation should not exceed 0.4V or 10% of Vout, whichever is greater. If the unit is trimmed up, the application requires that, under all conditions including current transients, the output voltage must be kept less than the redundant OVP, otherwise the unit will shutdown. Safety: An external input fuse must always be used to meet these safety requirements. Trim: The Leo converter has a novel regulation circuit that uses a differential measurement technique to eliminate voltage sense current. To trim the unit up, a resistor is connected from the trim pin to the Negative Sense pin. To trim the unit down, a resistor is connected from the trim pin to the Positive Sense pin. All models follow these trim equations: R TRIM DOWN = 2250/D – 30k Ω R TRIM UP = 750/Dk Ω where D is the percentage of trim (i.e. 10 = 10%). For example, to trim up 10%, a 75k Ω resistor External Output Trimming would be connected from the trim pin to the Negative Sense Pin. Power Good Signal The Leo generates a power good signal when the output voltage falls in a 5% window of the nominal value. The circuit tracks the trimmed voltage. The circuit has a response time of approximately 1ms. The output signal is derived from an internal 5V power bus and can source up to 5mA. If interfacing to other logic is required, the output can drive a resistor divider to set a new high level. The voltage is referenced to the V O(-) pin. Transient Response and Stability The Leo uses a high-bandwidth control to keep the output voltage in regulation. The crossover frequency of the Leo is approximately 15kHz (depending on the model) with greater than 60 degrees of phase margin. The control circuit maintains high phase margin at lower frequencies allowing the use of large amounts of external capacitance to be applies without loss of stability. If you require a high di/dt solution, Galaxy can adjust the gain of the control to take advantage of the on-board capacitance and improve the transient performance up to 5X the nominal value. If several Leos are used in parallel with current sharing, the transient response is improved by the number of Leos. For example, with two Leos a 60A step will give the same response as a single Leo with a 30A step, or about 1/2 the peak over/undershoot. + Sense Trim – Sense |
Similar Part No. - GPLW3V390MTRT002 |
|
Similar Description - GPLW3V390MTRT002 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |