rt8458 Richtek Technology Corporation, rt8458 Datasheet - Page 6

• Manufacturer Part Number: rt8458
• Description: High Efficiency Pwm Buck Led Driver Controller
• Manufacturer: Richtek Technology Corporation

RT8458
Typical Operating Characteristics
www.richtek.com
6
100%
95%
90%
85%
80%
75%
70%
200
180
160
140
120
100
80
60
40
20
55
51
47
43
39
35
0
110
Switching Frequency vs. Supply Voltage
0
0
6LED
5LED
4LED
3LED
130
5
Efficiency vs. Input Voltage
0.5
LED Current vs. V
10
Supply Voltage (V)
V
150
IN
Input Voltage (V)
= 110V to 220VAC, I
1
V
15
V
10LEDs, L = 1mH
ACTL
IN
170
= 110VAC, I
(V)
20
1.5
190
ACTL
25
10LED
9LED
8LED
7LED
OUT
OUT
2
= 178mA,
210
= 350mA
30
230
2.5
35
100%
95%
90%
85%
80%
75%
70%
190
185
180
175
170
165
160
50
48
46
44
42
40
-50
70
3
Switching Frequency vs. Temperature
100
-25
LED Current vs. Input Voltage
Efficiency vs. Number of LED
4
130
0
Number of LED (pcs)
5
V
Temperature (°C)
IN
Input Voltage (V)
V
10LEDs, L = 1mH
IN
= 110V to 220VAC, I
160
= 70V to 264VAC, I
25
6
DS8458-00 March 2011
110VAC
180VAC
220VAC
190
50
7
220
75
8
OUT
OUT
= 350mA
100
250
= 78mA,
9
125
280
10