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TPS51315RGFR датащи(PDF) 10 Page - Texas Instruments

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номер детали TPS51315RGFR
подробное описание детали  10-A STEP-DOWN SYNCHRONOUS SWITCHER WITH INTEGRATED MOSFETs
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS51315RGFR датащи(HTML) 10 Page - Texas Instruments

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PWM Frequency and Adaptive On Time Control
( )
12
OUT
ON
T on
IN
(2 / 3)V
100mV
T
19 10
R
50ns
V
-
æ
ö
+
=
´
´
+
ç
÷
è
ø
(3)
Soft-Start
Powergood
Output Discharge Control
TPS51315
SLUS881 – MAY 2009........................................................................................................................................................................................................ www.ti.com
TPS51315 employs an adaptive on-time control scheme and does not include a dedicated oscillator on the
device. However, the device runs with pseudo-constant frequency by feed-forwarding the input voltage and
output voltage to the on-time, one-shot timer. The on-time control is inversely proportional to the input voltage
and proportional to the output voltage, so that the duty ratio is maintained as VOUT/VIN with the same cycle time,
as shown in Equation 3.
where
• R
T(on)x is the external resistor connected from TON to LL
For the TPS51315, the input voltage is monitored at the LL pin during the ON state. An advantage of
switching-node monitoring is that any loss in the high-side n-channel FET becomes part of the on-time
calculation, thereby making the frequency more stable with load.
Another consideration regarding frequency is jitter. Jitter may have many causes, but the constant on-time
D-CAP mode scheme has some amount of inherent jitter. Because the output voltage ripple height is in the
range of approximately 20 mV, on the order of a milli-volt of noise on the feedback signal can affect the
frequency between approximately 3% and 10%. This is normal operation and risks only a small amount of
influence to the power supply performance.
The TPS51315 includes an independent, internal, 1.06-ms, voltage servo soft-start function with overcurrent limit.
When the EN_PSV pin goes high, an internal digita-to-analog converter (DAC) begins ramping up the reference
voltage to the error amplifier. Smooth control of the output voltage is maintained during start-up.
The TPS51315 includes a powergood output function. The powergood function is activated after the soft-start
function has completed. If the output voltage comes within ±5% of the target value, internal comparators detect a
powergood state and the powergood signal becomes high after a 64-
µs internal delay. If the output voltage rises
above or falls below 10% of the target value, the powergood signal goes low immediately.
The TPS51315 discharges output when EN_PSV is low or when the channel is in either a UVP or OVP fault
condition. The TPS51315 discharges output using an internal 20-
Ω MOSFET that is connected to VOUT_DS and
PGND. The current capability of the MOSFET is limited to discharge slowly. An external resistor can be
connected between VOUT_DS and VOUT to program discharge slow rate. In case the discharge function is not
wanted, leave VOUT_DS open.
10
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51315


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