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ST778 Datenblatt(PDF) 4 Page - STMicroelectronics

Teilenummer ST778
Bauteilbeschribung  LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST778 Datenblatt(HTML) 4 Page - STMicroelectronics

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ST777/778/779
4/11
TYPICAL APPLICATION CIRCUIT
APPLICATIONS INFORMATION
R1 and R2 must be placed only in ST779
applications to set the output voltage according to
the following equation:
VOUT = (1.23) [(R1+R2)/R2]
and to simplify the resistor selection:
R1 = R2 [(VOUT/1.23)-1]
It is possible to use a wide range of values for R2
(10K
Ω to 50KΩ) with no significant loss of
accuracy thanks to the very low FB input current.
To have 1% error, the current through R2 must be
at least 100 times FB’s bias current.
When large values are used for the feedback
resistors (R1>50K
Ω), stray output impedance at
FB can incidentally add "lag" to the feedback
response, destabilizing the regulator and creating
a larger ripple at the output. Lead lengths and
circuit board traces at the FB node should be kept
short. Compensate the loop by adding a "lead"
compensation capacitor (C3, 100pF to 1nF) in
parallel with R1.
The typical value of the L1 inductor is 22µH,
enough for most applications. However, are also
suitable values ranging from 10µF to 47µF with a
saturation rating equal to or greater than the peak
switch -current limit.
Efficiency will be reduced if the inductor works
near its saturation limit, while will be maximized
using an inductor with a low DC resistance,
preferably under 0.2
Ω.
Connecting ILIM to VIN the maximum LX current
limit (1A) is set. If this maximum value is not
required is possible to reduce it connecting a
resistor between ILIM and VIN (See Figure16to
choose the right value). The current limit value is
misured when the switch current through the
inductor begins to flatten and does’nt coincide with
the max short circuit current.
Even if the device is designed to tolerate a short
circuit
without
any
damage,
it
is
strictly
recommended to avoid a continuos and durable
short circuit of the output to GND.
To achieve the best performances from switching
power supply topology, particular care to layout
drawing is needed, in order to minimize EMI and
obtain low noise. Moreover, jitter free operation
ensures the full device functionality. Wire lengths
must be minimized, filter and by-pass capacitors
must be low ESR type, placed as close as
possible to the integrated circuit. Solder AGND
and PGND pins directly to a ground plane.
ST777
ST778
ST779
ILIM
L1
22µH
SEL / N.C. / FB
R1
V+
LX
Vout
SHDN
____
AGND
C1
22µF
C2
100µF
C3
Vin
1÷6V
1
3
8
7
2
5
6
4
Vo
PGND
R2


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