LT4430ES6#PBF Linear Technology, LT4430ES6#PBF Datasheet - Page 14

• Manufacturer Part Number: LT4430ES6#PBF
• Manufacturer: Linear Technology

Specifications of LT4430ES6#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

LT4430
APPLICATIONS INFORMATION
Figures 4a to 4d demonstrate bias supply circuits for the
fully-synchronous push-pull topology. Biasing for full-
bridge schemes is identical to the push-pull circuits with
the obvious difference in the primary-side drive. In Figure
4a, the bias supply equals (V
4d, the bias supply equals (2 • V
and 4e, the bias supply equals (V
In general, one of the simple, low-cost biasing schemes
suffi ces for LT4430 applications. However, design con-
Figure 4c. Typical Synchronous Push-Pull
Converter with Preregulator Bias
14
V
IN
Figure 4a. Typical Synchronous Push-Pull Converter
with Bias Generator
•
•
1:N
T1
•
•
V
D1
IN
ME
Q2
Q1
MF
R1*
•
•
1:N
T1
*OPTIONAL SEE TEXT
•
•
C1
Q2
ME
Q1
MF
R2
Z1
L1
R3*
IN
*OPTIONAL SEE TEXT
• N – V
QBS
D1
IN
C2
C
Z1
OUT
LT4430
V
V
BIAS
OUT
4430 F04c
L1
• N – V
R1*
– V
F
). In Figure 4b and
F
).
F
C1
C
Figure 4d. Typical Synchronous
Push-Pull Current-Doubler Converter
with Bias Generator
). In Figure 4c
OUT
LT4430
V
V
BIAS
OUT
4430 F04a
V
IN
•
•
1:N
T1
•
•
Q2
Q1
D1
ME
MF
straints such as a very wide input voltage range may force
employment of other biasing circuits. Other methods of
generating the bias supply may include an additional
transformer or output inductor winding, low-cost linear
regulators, discrete or monolithic charge pumps and
buck/boost regulators. However, if the bias supply gets this
complicated, a quick chat with your local LTC applications
engineer may result in a simpler solution.
L2
L1
*OPTIONAL SEE TEXT
R1*
Figure 4b. Typical Synchronous Push-Pull Converter
with 2x Bias Generator
C1
C
OUT
LT4430
V
V
BIAS
OUT
V
4430 F04d
IN
•
•
1:N
T1
•
•
Figure 4e. Typical Synchronous
Push-Pull Current-Doubler Converter
with Preregulator Bias
V
ME
Q2
Q1
MF
IN
•
•
1:N
T1
*OPTIONAL SEE TEXT
•
•
D1
Q2
Q1
D1
L1
R1*
R1*
ME
MF
L2
L1
C1
*OPTIONAL SEE TEXT
C1
C
OUT
LT4430
V
V
4430 F04b
BIAS
OUT
R2
Z1
R3*
C
QBS
OUT
V
OUT
C2
4430fa
LT4430
V
BIAS
4430 F04e