參數(shù)資料
型號(hào)： LT3512EMS#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
封裝： LEAD FREE, PLASTIC, MSOP-16/12
文件頁(yè)數(shù)： 7/26頁(yè)
文件大?。?/td> 244K
代理商： LT3512EMS#PBF
LT3512
15
3512fa
APPLICATIONS INFORMATION
Figure 8. BIAS Pin Configurations
order to regulate the output voltage, the LT3512 needs to
sample the flyback pulse. The LT3512 delivers a minimum
amount of energy even during light load conditions to
ensure accurate output voltage information. The minimum
delivery of energy creates a minimum load requirement
of 20mA to 25mA depending on the specific application.
Verify minimum load requirements for each application.
A Zener diode with a Zener breakdown of 20% higher
than the output voltage can serve as a minimum load if
pre-loading is not acceptable. For a 5V output, use a 6V
Zener with cathode connected to the output.
BIAS Pin Considerations
The BIAS pin powers the internal circuitry of the LT3512.
Three unique configurations exist for regulation of the BIAS
pin. In the first configuration, the internal LDO drives the
BIAS pin internally from the VINsupply.Inthesecondsetup,
the VIN supply directly drives the BIAS pin through a direct
connection bypassing the internal LDO. This configuration
will allow the part to operate down to 4.5V and up to 15V.
In the third configuration, an external supply or third wind-
ing drives the BIAS pin. Use this option when a voltage
supply exists lower than the input supply. Drive the BIAS
pin with a voltage supply higher than 3.3V to disable the
internal LDO. The lower voltage supply provides a more
efficient source of power for internal circuitry.
Overdriving the BIAS Pin with a Third Winding
The LT3512 provides excellent output voltage regulation
without the need for an opto-coupler, or third winding,
but for some applications with higher input voltages
(>20V), an additional winding (often called a third winding)
improves overall system efficiency. Design the third wind-
ing to output a voltage between 3.3V and 12V. For a typi-
cal 48VIN application, overdriving the BIAS pin improves
efficiency 4% to 5%.
Loop Compensation
An external resistor-capacitor network compensates the
LT3512 on the VC pin. Typical compensation values are in
the range of RC = 15k and CC = 4.7nF (see the numerous
schematics in the Typical Applications section for other pos-
sible values). Proper choice of both RC and CC is important
to achieve stability and acceptable transient response. For
example, vulnerability to high frequency noise and jitter
result when RC is too large. On the other hand, if RC is
too small, transient performance suffers. The inverse is
true with respect to the value of CC. Transient response
suffers with too large of a CC, and instability results from
too small a CC. The specific value for RC and CC will vary
based on the application and transformer choice. Verify
specific choices with board level evaluation and transient
response performance.
DESIGN PROCEDURE/DESIGN EXAMPLE
Use the following design procedure as a guide to design-
ing applications for the LT3512. Remember, the unique
sampling architecture requires an iterative process for
choosing correct resistor values.
The design example involves designing a 15V output with
a 200mA load current and an input range from 36V to 72V.
VIN(MIN) = 36V, VIN(NOM) = 48V, VIN(MAX) = 72V, VOUT =
15V and IOUT = 200mA
LT3512
3.3V < BIAS < 20V
6V TO 100V
BIAS
VIN
3512 F08
EXTERNAL
SUPPLY
LDO
LT3512
3V
6V TO 100V
BIAS
VIN
LDO
LT3512
4.5V TO 15V
BIAS
VIN
OPTIONAL
LDO
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