5 Pin Configuration and Functions

DVE Package16-Pin SOICTop View

Table 5-1 Pin Functions

PIN		TYPE ⁽¹⁾	DESCRIPTION
NAME	NO.	TYPE ⁽¹⁾	DESCRIPTION
EN	1	I	Enable pin. Forcing EN low disables the device. Pull high to enable normal device functionality.
GNDP	2	P	Power ground return connection for VINP.
GNDS	9	P	Connect to GNDS plane on printed circuit board. Do not use as only ground connection for VISO. Ensure pin 15 is connected to circuit ground.
GNDS	16	P
GNDS	15	P	Secondary side ground return connection for VISO. Connect bypass capacitor from VISO to this pin.
NC	6	—	Pins internally connected together. No other electrical connection. Pins belong to primary-side voltage domain. Connect to GNDP on printed circuit board.
	7
	8
	10	—	No internal connection. Pin belongs to isolated voltage domain. Connect to GNDS on printed circuit board.
	11
	12
SYNC	4	I	Synchronous clock input pin. Provide a clock signal to synchronize multiple devices or connect to GNDP for standalone operation using the internal oscillator. If the SYNC pin is left open make sure to it separate it from any switching noise to avoid false clock coupling.
SYNC_OK	5	O	Active-low, open-drain diagnostic output. Pin is asserted LOW if there is no external SYNC clock or one that is outside of the operating range of the UCC12040 is detected. In this state, the external clock is ignored and the DC-DC converter is clocked by the internal oscillator. The pin is in high-impedance if a clock is applied on SYNC.
SEL	13	I	V_ISO selection pin. V_ISO setpoint is 5.0 V when SEL is shorted to V_ISO, 5.4 V when SEL is connected to V_ISOthrough a 100-kΩ resistor, 3.3 V when SEL is shorted to GNDS, and 3.7 V when SEL is connected to GNDS through a 100-kΩ resistor. For more information see the Section 7.4 section.
VINP	3	P	Primary side input supply voltage pin. A 10-μF ceramic capacitor to GNDP on pin 2, placed close to the device pins, is required.
VISO	14	P	Isolated supply voltage pin. A 10-μF ceramic capacitor to GNDS on pin 15, placed close to the device pins, is required. See Section 8.2.2.1 section.

(1) P = Power, G = Ground, I = Input, O = Output