|TPS6755IPE4||ADJUSTABLE INVERTING DC/DC CONVERTER|
|TPS6755IPE4 Datasheet PDF : 19 Pages |
ADJUSTABLE INVERTING DC/DC CONVERTER
SLVS155A – NOVEMBER 1996 REVISED DECEMBER 1996
output filter capacitor
A low equivalent series resistance (ESR) output filter capacitor is necessary to minimize the output-ripple
voltage. An ESR of 100 mΩ limits the output ripple to 90 mV or less for output loads up to 200 mA.
A Schottky diode or high-speed silicon rectifier should be used with a maximum continuous current rating of
1 A for operation up to full load.
output ripple filtering
A low-pass filter may be added to the converter output to reduce the output voltage ripple (see Figure 15). The
LC filter has a cutoff frequency of 7.2 kHz. The inductor filter must have a low resistance to avoid large output
voltage drops. The output voltage ripple is reduced to 5 mV when the LC output filter is used. FB must be
connected to the output node before the connection for the low-pass filter.
adjustable output voltage
The output voltage of the TPS6755 is limited to VO ≤ 12 V – VCC and is set by two external resistors, R4 and
R5 (see Figure 15). R5 can be set to any value between 10 kΩ to 20 kΩ, and R4 is calculated using the following
formula: R4 = VO R5/1.22 V. These resistors form a voltage divider between FB, COMP, and REF. The
converter adjusts the output such that COMP level is at GND.
printed circuit board layout
A ground plane is recommended in a printed circuit board (PCB) layout to ensure quiet operation. Attention
should be given to minimizing the lengths of the switching loops. Bypass capacitors should be placed as close
to the TPS6755 as possible to prevent instability and noise pickup. VCC and GND should be bypassed directly
with a 1-µF ceramic capacitor and a large bypass capacitor (e.g. 47 µF) to maximize noise immunity. The
TPS6755 should not be used with IC sockets, wire-wrap prototype boards, or other constructions that are
susceptible to noise pick-up.
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