User manual

EXAS

NSTRUMENTS

AMP Meter 1

AMP Meter 2

L.E.D Load

Volt Meter 1 Volt Meter 2

+ -

Dimmer

MaxMin

AC Source

7.10 7.2

Test Setup

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5 Test Setup

WARNING

High voltages that may cause injury exist on this evaluation

module (EVM). Please ensure all safety procedures are followed

when working on this EVM. Never leave a powered EVM

unattended. The use of isolated equipment is highly recommended.

5.1 Test Equipment

Voltage Source: 105 V

RMS

to 135 V

RMS

isolated AC source capable of at least 20 W.

Multimeters: Two voltmeters for measuring up to 35 V

each and two ammeters for up to 1 A each.

Output Load: 9 LEDs in series (VF = 3.4 V at 330 mA per LED)

Oscilloscope: 4 channel 100 MHz with high-voltage probe rated for at least 600 V.

Recommended Wire Gauge: 18 AWG not more than two feet long.

5.2 TPS92001EVM-645 Recommended Test Setup

Figure 2. Recommended Test Set Up

5.3 List of Test Points

Table 2. Test Point Functions

TEST POINTS NAME DESCRIPTION

TP1 LED + LED output

TP2 LED ¬- LED return point

TP3 CS Feedback pin of TPS92001

TP4 CT Clock signal

TP5 SW Buck switch node

TP6 Bulk- Rectified AC negative input

TP7 Bulk + Rectified AC positive input

TP8 Line AC line input

TP9 Neutral AC neutral input

Dimmable LED Lighting Driver Controller SLUU897– March 2012

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