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LTM8056 Scheda tecnica(PDF) 12 Page - Linear Technology

Il numero della parte LTM8056
Spiegazioni elettronici  58VIN, 48VOUT Buck-Boost 關Module Regulator
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

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LTM8056
12
8056fa
For more information www.linear.com/LTM8056
APPLICATIONS INFORMATION
Capacitor Selection Considerations
The CIN and COUT capacitor values in Table 1 are the
minimum recommended values for the associated oper-
ating conditions. Applying capacitor values below those
indicated in Table 1 is not recommended, and may result
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response, if
it is necessary. Again, it is incumbent upon the user to
verify proper operation over the intended system’s line,
load and environmental conditions.
Ceramic capacitors are small, robust and have very low
ESR. However, not all ceramic capacitors are suitable.
X5R and X7R types are stable over temperature and ap-
plied voltage and give dependable service. Other types,
including Y5V and Z5U have very large temperature and
voltage coefficients of capacitance. In an application cir-
cuit they may have only a small fraction of their nominal
capacitance resulting in much higher output voltage ripple
than expected.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8056. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (underdamped) tank circuit.
If the LTM8056 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possi-
bly exceeding the device’s rating. This situation is easily
avoided; see the Hot-Plugging Safely section.
Frequency Selection
The LTM8056 uses a constant frequency PWM architec-
ture that can be programmed to switch from 100kHz to
800kHz by tying a resistor from the RT pin to ground.
Table 3 provides a list of RT resistor values and their re-
sultant frequencies.
Table 3. Switching Frequency vs RT Value
FREQUENCY
RT VALUE (kΩ)
100
453
200
147
300
84.5
400
59
500
45.3
600
36.5
700
29.4
800
24.9
An external resistor within the range stated in Table 3
from RT to GND is required. Even when synchronizing to
an external clock. When synchronizing the switching of
the LTM8056 to an external signal source, the frequency
range is 200kHz to 700kHz.
Operating Frequency Trade-Offs
It is recommended that the user apply the optimal RT
value given in Table 1 for the input and output operating
condition. System level or other considerations, however,
may necessitate another operating frequency. While the
LTM8056 is flexible enough to accommodate a wide range
of operating frequencies, a haphazardly chosen one may
result in undesirable operation under certain operating or
fault conditions. A frequency that is too high can reduce
efficiency, generate excessive heat or even damage the
Table 2. Electrolytic Caps Used in LTM8056 Testing
DESCRIPTION
MANUFACTURER
PART NUMBER
100µF, 6V, 75mΩ, Tantalum C Case
AVX
TPSC107M006R0075
100µF, 16V, 100mΩ, Tantalum Y Case
AVX
TPSY107M016R0100
68µF, 16V, 200mΩ, Tantalum C Case
AVX
TPSC686M016R0200
47µF, 25V, 900mΩ, Tantalum D Case
AVX
TAJD476M025R
33µF, 35V, 300mΩ, Tantalum D Case
AVX
TPSD336M035R0300
10µF, 50V, 120mΩ, Aluminum 6.3 × 6mm case
Suncon
50HVP10M
10µF, 63V, 120mΩ, Aluminum 6.3 × 5.8mm case
Panasonic
EEHZA1J100P


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