ld7578 Leadtrend Technology, ld7578 Datasheet - Page 8

• Manufacturer Part Number: ld7578
• Description: Green-mode Pwm Controller With Hv Start-up Circuit And Otp Protection
• Manufacturer: Leadtrend Technology

Leadtrend Technology Corporation
LD7578-DS-00 October 2008
4.5
5.0
7.0
6.5
6.0
5.5
60
62
85
80
75
70
65
70
64
60
68
66
11
-40
-40
12
Fig. 11 V
Fig. 9 Max Duty vs. Temperature
14
0
0
COMP
Fig. 7 Frequency vs. Vcc
Temperature (°C)
16
open loop voltage vs. Temperature
Temperature (°C)
Vcc (V)
40
40
18
20
www.leadtrend.com.tw
80
80
22
120 125
24
120 125
25
8
6.0
5.5
5.0
4.5
4.0
3.5
35
30
25
20
15
10
25
23
21
19
17
15
11
-40
-40
12
Fig. 12 OLP-Trip Level vs. Temperature
Fig. 8 Green mode frequency vs. Vcc
Fig. 10 VCC OVP vs. Temperature
14
0
0
16
Temperature (°C)
Temperature (°C)
Vcc (V)
40
40
18
LD7578
20
80
80
22
120 125
120 125
24
25