Datasheet

4.2.3 Output Connections
4.3 Startup and Test Procedure
4.4 Evaluation Module Configuration
www.ti.com Test Setup
Configure the output connections in the following order.
Step 1. Connect LOAD1 and LOAD2 to 5V_OUT and 3.3V_OUT, respectively. Set LOAD1 and
LOAD2 to sink 0 A dc before V
IN
is applied.
Step 2. Connect voltmeters V4-V7 as shown in Figure 2 .
1. Ensure that LOAD1 and LOAD2 are set to constant current mode and to sink 0 A dc.
2. Increase V
IN
(V1) from 0 V to 10 V dc. 5V_OUT (V4), 3.3V_OUT (V5), and 3.3V_RTC (V6) should
correspond to the specifications shown in Table 1 .
3. Vary the LOAD of 5V_OUT and 3.3V_OUT from 0 mA dc to 100 mA dc. 5V_OUT and 3.3V_OUT
should remain within the specifications given Table 1 for all load combinations on LOAD up to 100 mA.
4. Vary V
IN
from 5.5 V dc to 28 V dc. 5V_OUT (V4), 3.3V_OUT (V5), and 3.3V_RTC (V6) should
correspond to the specifications shown in Table 1 .
5. Keep V
IN
at 12 V. Increase VIN5 (V2) to 5.5 V; then toggle switch S1 as shown in the following EVM
configuration to enable a 5-V switchover function. Measure 5V_OUT (V4) at a no load condition; V4
should be very close to V2. Measure 15V_OUT (V7) at a no load state; it should be within the limits
given in Table 1 .
6. Keep V
IN
at 12 V. Increase VIN3.3 (V3) to 3.5 V, and toggle switch S2 as shown in the following EVM
configuration to enable a 3.3-V switchover function. Measure 3.3V_OUT (V5) at a no load condition;
V5 should be very close to V3.
By default, the switchover function is disabled. To enable the switchover function, simply toggle switches
S1 and S2 for a 5-V and 3.3-V switchover, respectively. The position of the switch is opposite of the pins
shorted.
Figure 3. 5-V and 3.3-V Enable Configuration Figure 4. Switchover Function Enabled
SLUU303A – JUNE 2008 – Revised SEPTEMBER 2008 Using the TPS51103EVM Integrated 3.3-V/5-V Power LDO with Clock Output 7
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