Datasheet

UCD7242
UCD9222
UCD9222
SLVSAL7A –NOVEMBER 2010– REVISED FEBRUARY 2011 www.ti.com
Table 1. PIN FUNCTIONS (continued)
PIN NO. PIN LABEL DESCRIPTION
48 ADC_Ref ADC Reference. Tie to analog ground through 0.1µF capacitor
PowerPad It is recommended that this pad be connected to analog ground
TYPICAL APPLICATION SCHEMATIC
Figure 3 shows the UCD9222 power supply controller as part of a system that provides the regulation of two
independent power supplies. The loop for each power supply is created by the respective voltage outputs feeding
into the differential voltage error ADC (EADC) inputs, and completed by DPWM outputs feeding into the gate
drivers for each power stage.
The ±V
sense
rail signals must be routed to the EAp/EAn input that matches the DPWM number that controls the
output power stage. For example, the power stage driven by DPWM1A must have its feedback routed to EAP1
and EAN1.
Figure 3. Typical Application Schematic
10 Submit Documentation Feedback © 2010–2011, Texas Instruments Incorporated
Product Folder Link(s) :UCD9222