Datasheet

Oscilloscope
20V/DIV, 1us/DIV
CH1
Power Supply
43V/48V/53V
(CC set @ 1.2A)
Signal Generator
3V,200Hz, D=0.5
LED
Load
Module
(V
F
§32.5V)
DC Ammeter
LED+ LED-
TP5(LED+)
TP6(LED-)
TP10(SW)
+
-
TP4(GND)
TP1(VIN)
TP2(UDIM)
+
+
+
-
-
-
µ;¶: Q3, C9 and R11 are not populated.
www.ti.com Test Requirements and Setup
5 Test Requirements and Setup
5.1 Hardware Requirements
The basic hardware requirements for EVM evaluation are listed in Table 3.
Table 3. Hardware Requirements for EVM Evaluation
Item Description Characteristics
Input Power Source
DC power supply Generic DC power supply 43 V
DC
– 53 VDC, 1.5 A
Load
LED load module Power LED string of 10 LEDs connected in series and Nominal forward voltage of the string in
capable of running at 1-A current the range of 32 V
DC
to 35 V
DC
at 1 A
Equipment
Digital Multimeters Agilent HP34401 6½ digit DMM or equivalent DMM
Signal Generator Agilent 33220A or equivalent signal generator
Oscilloscopes Tektronix TDS3034B or equivalent for monitoring
waveforms
5.2 Hardware Setup
Figure 3. Test Connection Diagram of the TPS92641EVM
• CAUTION: LEDs are very bright; wearing safety glasses with dark lens is recommended.
• Setup the equipments and connect the test setup as shown in Figure 3.
• Power-up the power supply and signal generator (Output OFF). Turn on the output of the power supply
and measure LED current through the DC Ammeter and the input current from the power supply.
• Observe the waveform from the oscilloscope and record the switching frequency. Confirm the
operation is stable with no jittering.
• Enable the output of the signal generator and measure LED current through the DC Ammeter and
observe the switching waveform at the switching node.
7
SLVU823–December 2012 User's Guide for the TPS92641EVM
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