ZHCSOO6C August 2000 – August 2021 DCV010505 , DCV010505D , DCV010512 , DCV010512D , DCV010515 , DCV010515D , DCV011512D , DCV011515D , DCV012405 , DCV012415D
PRODUCTION DATA
When more than one DC/DC converter is needed onboard, beat frequencies and other electrical interference can be generated. This interference occurs because of the small variations in switching frequencies between the DC/DC converters.
The DCV01 series of devices overcome this interference by allowing devices to be synchronized to one another. Synchronize up to eight devices by connecting the SYNC pins of each device, taking care to minimize the capacitance of tracking. Stray capacitance (greater than 3 pF) reduces the switching frequency, or can sometimes stop the oscillator circuit. The maximum recommended voltage applied to the SYNC pin is 3 V.
For an application that uses more than eight synchronized devices use an external device to drive the SYNC pins. External Synchronization of the DCP01/02 Series of DC/DC Converters (SBAA035) describes this configuration.
During the start-up period, all synchronized devices draw maximum current from the input simultaneously. If the input voltage falls below approximately 4 V, the devices may not start up. A ceramic capacitor must be connected close to the input pin of each device. Use a 2.2-μF capacitor for 5-V and 15-V input devices, and a 0.47-μF capacitor for the
24-V devices.