LT4430IS6#PBF Linear Technology, LT4430IS6#PBF Datasheet - Page 13

• Manufacturer Part Number: LT4430IS6#PBF
• Manufacturer: Linear Technology

Specifications of LT4430IS6#PBF

• Operating Temperature (max): 125C
• Operating Temperature (min): -40C
• Pin Count: 6
• Mounting: Surface Mount
• Package Type: TSOT-23
• Case Length: 2.9mm
• Screening Level: Automotive
• Lead Free Status / RoHS Status: Compliant

APPLICATIONS INFORMATION
Generate a bias supply for a forward converter using similar
techniques to that of the fl yback converter. Figure 3a to 3c
detail the three common bias circuits for the synchronous
single-switch forward converter. In the fl yback converter
of Figure 1d, the bias supply is proportional to V
Figure 3b. Single-Switch Synchronous Forward Converter
with Tapped Secondary Bias Generator
V
IN
N = N1 + N2
• •
1:N
T1
•
•
N2
N1
Q1
FG
Q2
D1
Figure 3a. Typical Single-Switch Synchronous Forward
Converter with Bias Generator
CG
L1
*OPTIONAL SEE TEXT
R1*
V
IN
C1
C
•
OUT
LT4430
V
V
1:N
T1
BIAS
4430 F03b
OUT
•
Q1
IN
and
FG
Q2
D1
V
decouples the bias supply from V
bias supply equals (V
supply equals (V
supply equals (V
OUT
Figure 3c. Single-Switch Synchronous Forward Converter
with Preregulator Bias Generator
CG
. However, in the forward converter, L1’s presence
R1*
L1
*OPTIONAL SEE TEXT
V
IN
C1
C
OUT
•
LT4430
V
V
BIAS
OUT
4430 F03a
1:N
T1
•
Z1
Q1
IN
– V
• N1/N – V
D1
IN
F
).
FG
• N – V
R1*
C1
Q2
F
F
). In Figure 3c, the bias
). In Figure 3b, the bias
R2
CG
Z1
OUT
R3*
L1
*OPTIONAL SEE TEXT
. In Figure 3a, the
QBS
C2
C
LT4430
OUT
LT4430
V
V
BIAS
OUT
4430 F03c
13
4430fa