Datasheet

FUNCTIONAL BLOCK DIAGRAM
OUT
SW
Ramp
Generator
Oscillator
CurrentSensor
FB
GND
+
EA
PWMControl
VBATEN
Gate
Driver
Ref.
VO
VIN
Gate
Driver
Precharge
On/offcontrol
EN
PWM
Pre-
regulator
VIN
OVP
OLP
NC
Soft
Startup
EN
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
TPS61166
SLVS991 – SEPTEMBER 2009 .......................................................................................................................................................................................... www.ti.com
(Figure 1), L = TOKO #A915_Y-4R7M, VIN = 3.6 V, LOAD = 4 LEDS unless otherwise noted FIGURE
η LED Efficiency vs Led current; Five LEDs (14.5 V) 3
η LED Efficiency vs Led current; Four LEDs (11.5 V) 4
η LED Efficiency vs Led current; Three LEDs (8.5 V) 5
V
FB
FB voltage vs Input voltage 6
V
FB
FB voltage vs VBAT voltage 7
V
FB
FB voltage vs Free-air temperature 8
Switch current limit vs Free-air temperature 9
PWM dimming operation 1 kHz with 30% duty cycle 10
PWM dimming operation 15 kHz with 10% duty cycle 11
PWM switch operation 15 kHz with 10% duty cycle 12
PWM dimming linearity 100 Hz, 1 kHz, 40 kHz; 13
PWM dimming linearity (zoom in) 100 Hz, 1 kHz, 40 kHz; 14
Over voltage protection 15
Soft start up in PWM dimming 16
Soft start up with EN and PWM tied together 17
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