rt8470 Richtek Technology Corporation, rt8470 Datasheet - Page 8

• Manufacturer Part Number: rt8470
• Description: 1.2a/1a, Hysteretic, High Brightness Led Driver With Internal Switch
• Manufacturer: Richtek Technology Corporation

(500mA/Div)
RT8470
www.richtek.com
8
I
(2V/Div)
OUT
V
ADJ
-0.2
350
340
330
320
310
300
290
280
270
260
250
1.0
0.8
0.6
0.4
0.2
0.0
-50
-50
Ramp Frequency vs. Temperature
Leakage Current vs. Temperature
-25
-25
Digital Dimming from ADJ Off
0
0
Temperature (°C)
Temperature (°C)
Time (2.5μs/Div)
25
25
R
1LED, V
50
S
= 0.1Ω, f
50
75
IN
= 12V
Dimming
75
100
= 500Hz,
100
125
150
125
(500mA/Div)
(500mA/Div)
I
I
(2V/Div)
(5V/Div)
OUT
OUT
V
V
1100
1050
1000
ADJ
950
900
850
800
IN
-50
Input Current vs. Temperature
-25
Digital Dimming from ADJ On
Power On from VIN
0
Temperature (°C)
Time (2.5μs/Div)
Time (1ms/Div)
25
R
1LED, V
DS8470-03 March 2011
R
S
S
= 0.1Ω, f
= 0.1Ω or 100mΩ, 1LED
50
IN
= 12V
Dimming
75
= 500Hz,
100
125