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参数资料
| 型号： | LTC1436AEGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件页数： | 3/28页 |
| 文件大小： | 493K |
| 代理商： | LTC1436AEGN#PBF |
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11
LTC1436A
LTC1436A-PLL/LTC1437A
14367afb
OPERATIO
U
(Refer to Functional Diagram)
Power-On Reset
The POR pin is an open drain output which pulls low when
the main regulator output voltage is out of regulation.
When the output voltage rises to within 7.5% of regula-
tion, a timer is started which releases POR after 216
(65536) oscillator cycles. In shutdown, the POR output is
pulled low.
Auxiliary Linear Regulator
The auxiliary linear regulator in the LTC1436A/LTC1437A
controls an external PNP transistor for operation up to
500mA. An internal AUXFB resistive divider set for 12V
operation is invoked when AUXDR pin is above 9.5V to
allow 12V VPP supplies to be easily implemented. When
AUXDR is below 8.5V an external feedback divider may be
used to set other output voltages. Taking the AUXON pin
low shuts down the auxiliary regulator providing a conve-
nient logic controlled power supply.
The AUX block can be used as a comparator having its
inverting input tied to the internal 1.19V reference. The
AUXDR pin is used as the output and requires an external
pull-up to a supply less than 8.5V in order to inhibit the
invoking of the internal resistive divider.
INTVCC/DRVCC/EXTVCC Power
Power for the top and bottom MOSFET drivers and most
of the other LTC1436A/LTC1437A circuitry is derived from
the INTVCC pin. The bottom MOSFET driver supply DRVCC
pin is internally connected to INTVCC in the LTC1436A and
externally connected to INTVCC in the LTC1437A. When
the EXTVCC pin is left open, an internal 5V low dropout
regulator supplies INTVCC power. If EXTVCC is taken above
4.8V, the 5V regulator is turned off and an internal switch
is turned on to connect EXTVCC to INTVCC. This allows the
INTVCC power to be derived from a high efficiency external
source such as the output of the regulator itself or a
secondary winding, as described in the Applications Infor-
mation section.
APPLICATIONS INFORMATION
WU
U
The basic LTC1436A application circuit is shown in Figure
1, High Efficiency Step-Down Converter. External compo-
nent selection is driven by the load requirement, and
begins with the selection of RSENSE. Once RSENSE is
known, COSC and L can be chosen. Next, the power
MOSFETs and D1 are selected. Finally, CIN and COUT are
selected. The circuit shown in Figure 1 can be configured
for operation up to an input voltage of 28V (limited by the
external MOSFETs).
RSENSE Selection For Output Current
RSENSE is chosen based on the required output current.
The LTC1436A/LTC1437A current comparator has a maxi-
mum threshold of 150mV/RSENSE and an input common
mode range of SGND to INTVCC. The current comparator
threshold sets the peak of the inductor current, yielding a
maximum average output current IMAX equal to the peak
value less half the peak-to-peak ripple current
IL.
Allowing a margin for variations in the LTC1436A/
LTC1437A and external component values yields:
R
mV
SENSE
MAX
=
100
I
The LTC1436A/LTC1437A work well with RSENSE values
≥ 0.005.
COSC Selection for Operating Frequency
The LTC1436A/LTC1437A use a constant frequency
architecture with the frequency determined by an external
oscillator capacitor COSC. Each time the topside MOSFET
turns on, the voltage on COSC is reset to ground. During the
on-time, COSC is charged by a fixed current plus an
additional current which is proportional to the output
voltage of the phase detector VPLLLPF (LTC1436A-PLL/
LTC1437A). When the voltage on the capacitor reaches
1.19V, COSC is reset to ground. The process then repeats.
The value of COSC is calculated from the desired operating
frequency. Assuming the phase-locked loop has no exter-
nal oscillator input (VPLLLPF = 0V):
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