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LM3224MMX-ADJ датащи(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM3224MMX-ADJ
подробное описание детали  615kHz/1.25MHz Step-up PWM DC/DC Converter
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3224MMX-ADJ датащи(HTML) 9 Page - National Semiconductor (TI)

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Operation
CONTINUOUS CONDUCTION MODE
The LM3224 is a current-mode, PWM boost regulator. A
boost regulator steps the input voltage up to a higher output
voltage. In continuous conduction mode (when the inductor
current never reaches zero at steady state), the boost regu-
lator operates in two cycles.
In the first cycle of operation, shown in Figure 1 (a), the
transistor is closed and the diode is reverse biased. Energy
is collected in the inductor and the load current is supplied by
C
OUT.
The second cycle is shown in Figure 1 (b). During this cycle,
the transistor is open and the diode is forward biased. The
energy stored in the inductor is transferred to the load and
output capacitor.
The ratio of these two cycles determines the output voltage.
The output voltage is defined approximately as:
where D is the duty cycle of the switch, D and D' will be
required for design calculations.
SETTING THE OUTPUT VOLTAGE
The output voltage is set using the feedback pin and a
resistor divider connected to the output as shown in the
typical operating circuit. The feedback pin voltage is 1.26V,
so the ratio of the feedback resistors sets the output voltage
according to the following equation:
SOFT-START CAPACITOR
The LM3224 has a soft-start pin that can be used to limit the
inductor inrush current on start-up. The external SS pin is
used to tailor the soft-start for a specific application but is not
required for all applications and can be left open when not
needed. When used, a current source charges the external
soft-start capacitor, Css. The soft-start time can be estimated
as:
Tss = Css*1.24V/Iss
THERMAL SHUTDOWN
The LM3224 includes thermal shutdown protection. If the die
temperature exceeds 140˚C the regulator will shut off the
power switch, significantly reducing power dissipation in the
device. The switch will remain off until the die temperature is
reduced to approximately 120˚C. If the cause of the excess
heating is not removed (excessive ambient temperature,
excessive power dissipation, or both) the device will con-
tinue to cycle on and off in this manner to protect from
damage.
20097602
FIGURE 1. Simplified Boost Converter Diagram
(a) First Cycle of Operation (b) Second Cycle Of Operation
www.national.com
9


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