Texas Instruments TPS61150A-150 Evaluation Board TPS61150AEVM-150 TPS61150AEVM-150 TPS61150AEVM-150 ユーザーズマニュアル
製品コード
TPS61150AEVM-150
www.ti.com
2.1
Test Setup
2.2
Test Results
50
60
70
80
90
0
5
10
15
20
25
I
- WLED Current - mA
O
Efficiency-%
30
V
= 3.6 V
IN
4 WLEDs
SEL1 =
SEL2 =
SEL1 =
SEL2 =
high
low
low
50
60
70
80
100
90
0
10
20
30
40
50
I
-Total Output Current - mA
O
Efficiency-%
V
= 3.6
IN
4 WLED1s
4 WLED2s
SEL1 = high
SEL2 = high
4 WLED2s
SEL1 = high
SEL2 = high
Input/Output Connector Descriptions
The TPS61150 and TPS61150A are designed to operate with a maximum input voltage of 6V. Connect a
power supply set between 2.5 V and 6.0 V output voltage and current limit set to at least 1 A. Short
jumper JP1 and/or JP2 to enable the boost converter. Short JP3 and open JP5 to enable LEDs D1
through D4. Short JP4 to enable LEDs D5 through D6.
power supply set between 2.5 V and 6.0 V output voltage and current limit set to at least 1 A. Short
jumper JP1 and/or JP2 to enable the boost converter. Short JP3 and open JP5 to enable LEDs D1
through D4. Short JP4 to enable LEDs D5 through D6.
To implement analog dimming, use the datasheet to determine the size for resistors R3 and/or R4, install
one or both and apply a DC voltage to appropriate pin of JP6. To implement PWM analog dimming, use
the datasheet to determine the size for resistors R3, R5 and capacitor C3 and/or resistors R4, R6 and
capacitor C4, install one or both component sets and apply a PWM signal within the amplitude and
frequency specified in the datasheet to the appropriate pin of JP6. Alternatively, a PWM signal within the
range specified in the datasheet applied to the SEL1 and/or SEL2 pins through JP1 and/or JP2,
respectively, implements PWM dimming.
one or both and apply a DC voltage to appropriate pin of JP6. To implement PWM analog dimming, use
the datasheet to determine the size for resistors R3, R5 and capacitor C3 and/or resistors R4, R6 and
capacitor C4, install one or both component sets and apply a PWM signal within the amplitude and
frequency specified in the datasheet to the appropriate pin of JP6. Alternatively, a PWM signal within the
range specified in the datasheet applied to the SEL1 and/or SEL2 pins through JP1 and/or JP2,
respectively, implements PWM dimming.
Below are the test results at T
A
= 25
°
C using this EVM:
Figure 1. Efficiency vs. WLED Output Current
Figure 2. Both On Efficiency
vs. Total Output Current
Note that when measuring the WLED output voltage for the efficiency computation, the output
voltage from the IC's I
voltage from the IC's I
OUT
pin to ground was used, which includes the voltage drop across the
series ammeter, used to measure the WLED current, as well as the voltage drop across the internal
current sink circuit and external current setting resistor.
current sink circuit and external current setting resistor.
TPS61150EVM-150 / TPS61150AEVM-150
4
SLVU142A – July 2006 – Revised November 2006