Datasheet

SW
Ramp
Generator
Oscillator
Current
Sensor
OLP
CTRL
GND
C3
L1
+
FB
Reference
Control
D1
Error
Amplifer
2
1
Rset
C2
Vin
C1
PWM Control
4
6
Soft
Start-up
5
3
COMP
TPS61160
TPS61161
www.ti.com SLVS791C –NOVEMBER 2007–REVISED APRIL 2012
FUNCTIONAL BLOCK DIAGRAM
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
FIGURE
Efficiency TPS61160/1 VIN = 3.6 V; 4, 6, 8, 10 LEDs; L = 22 μH Figure 2
Efficiency TPS61160 Figure 3
Efficiency TPS61161 Figure 4
Current limit T
A
= 25°C Figure 5
Current limit Figure 6
Easyscale step Figure 7
PWM dimming linearity VIN = 3.6 V; PWM Freq = 10 kHz and 40 kHz Figure 7
Output ripple at PWM dimming 8 LEDs; VIN = 3.6 V; I
LOAD
= 20 mA; PWM Freq = 10 kHz Figure 9
Switching waveform 8 LEDs; VIN = 3.6 V; I
LOAD
= 20 mA; L = 22 μH Figure 10
Start-up 8 LEDs; VIN = 3.6 V; I
LOAD
= 20 mA; L =22 μH Figure 11
Open LED protection 8 LEDs; VIN = 3.6 V; I
LOAD
= 20 mA; L = 22 μH Figure 12
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