Texas Instruments TPS61166-446 Evaluation Board TPS61166EVM-446 TPS61166EVM-446 TPS61166EVM-446 사용자 설명서
제품 코드
TPS61166EVM-446
5.9
TP1 – Test Point 1
5.10 TP2 – Test Point 2
6
Test Setup and Results
0
10
20
30
40
50
60
70
80
90
0
5
10
15
20
25
ILED - LED Current - mA
LEDEfficiency-%
30
Time = 200 s/div
µ
ILED = 20 mV/div
IL = 500 mA/div
Vo-AC = 100 mV/div
Test Setup and Results
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This test point connects to the IC's VO pin. Since the VO pin is the output of the boost converter before
the internal PWM dimming switching, the user can monitor the boost converter output and, for example,
confirm that the over voltage protection circuit properly clamps the output voltage if the LEDs are removed
from the output.
the internal PWM dimming switching, the user can monitor the boost converter output and, for example,
confirm that the over voltage protection circuit properly clamps the output voltage if the LEDs are removed
from the output.
This test point can be used to measure the small signal control loop gain and phase with Venable® or
similar gain phase analyzer. For example, the user would replace the 0-
similar gain phase analyzer. For example, the user would replace the 0-
Ω
resistor in R2 with a 49.9-100
Ω
resistor before attaching a Venable® gain/phase analyzer between header J5 and TP2.
Figure 2. LED Efficiency
Figure 3. 1kHz PWM Dimming with D = 30%
TPS61166EVM-446 User's Guide
6
SLVU326 – October 2009