L6668 STMicroelectronics, L6668 Datasheet - Page 8

• Manufacturer Part Number: L6668
• Description: IC CTRLR PWM PROG CM HV 16SOIC
• Manufacturer: STMicroelectronics

Specifications of L6668

• Output Isolation: Isolated
• Frequency Range: 93 ~ 107kHz
• Voltage - Input: 9.4 ~ 22 V
• Power (watts): 750mW
• Operating Temperature: -25°C ~ 150°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Number Of Outputs: 1
• Duty Cycle (max): 75 %
• Output Current: 800 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 105 KHz
• Maximum Operating Temperature: + 150 C
• Fall Time: 30 ns
• Minimum Operating Temperature: - 25 C
• Rise Time: 55 ns
• Synchronous Pin: No
• Topology: Flyback
• Load-dependent Current-mode Control: FIXED-FREQUENCY (HEAVY LOAD), FREQUENCY FOLDBACK (LIGHT LOAD), BURST-MODE (NO-LOAD)
• For Use With: 497-6389 - BOARD EVAL USING L6668 & STSR30497-5499 - EVAL BOARD FOR L6668
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6668
Figure 11. Start-up & UVLO vs. Tj
Figure 12. Vcc Zener voltage vs. Tj
Figure 13. COMP voltage upper clamp level vs. Tj
8/23
V
(V)
CC (pin 5)
Vcc
(V)
V
(V)
COMP
Z (pin 5)
26
25
24
23
22
21
20
14
13
12
11
10
6.5
5.5
(pin 10)
9
8
-50
7
6
5
-50
-50
ON
latched off
OFF while
OFF
0
0
0
Tj (°C)
Tj (°C)
Tj (°C)
50
50
50
Vcc = 15 V
100
100
100
150
150
150
Figure 14. COMP source current vs. Tj
Figure 15. COMP dynamic resistance vs. Tj
Figure 16. Max. duty-cycle vs. Tj
R
R
(kΩ)
(kΩ)
I
COMP
COMP (pin 10)
COMP (pin 10)
(%)
32
32
30
30
28
28
26
26
24
24
22
22
20
20
18
18
140%
120%
100%
(pin 10)
75
74
73
72
71
70
80%
60%
-50
-50
-50
-50
Values normalized to I
0
0
0
0
Tj (°C)
Tj (°C)
Tj (°C)
Tj (°C)
50
50
50
50
COMP
V
Vcc = 15 V
Vcc = 15 V
100
COMP
100
100
Vcc = 15 V
Vcc = 15 V
@ 25°C
100
= 1 V
150
150
150
150