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LTM4651 データシート(PDF) 17 Page - Linear Technology

部品番号 LTM4651
部品情報  EN55022B Compliant 58V, 24W Inverting-Output DC/DC 關Module Regulator
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

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LTM4651
17
4651f
For more information www.linear.com/LTM4651
Power Module Protection
TheLTM4651’scurrentmodecontrolarchitectureprovides
fast cycle-by-cycle current limit in an overcurrent condi-
tion, as shown in the Typical Performance Characteristics
section. If the output voltage collapses sufficiently due to
an overload or short-circuit condition, minimum on-time
will be violated (EQ. 3) and the internal oscillator will then
fold-back automatically to one-fifth of the LTM4651’s
programmed switching frequency—hereby reducing the
output current and affording the load a chance to recover.
The LTM4651 features input overvoltage shutdown
protection: when VIN+|VOUT–| > 68V, switching action
ceases (with 4V of hysteresis)—however, be advised that
this protection is only active outside the LTM4651’s safe
operating area (see Note 1 and Note 4 of the Electrical
Characteristics table).
The LTM4651 ceases switching action if internal tempera-
tures exceed 165°C. The control IC resumes operation
after a 10°C cool-down hysteresis. Note that these typical
parameters are based on measurements in a lab oven and
arenotproductiontested.Thisovertemperatureprotection
is intended to protect the device during momentary over-
loadconditions.Themaximumratedjunctiontemperature
will be exceeded when this overtemperature protection is
active. Continuous operation above the specified absolute
maximum operating junction temperature may impair
device reliability or permanently damage the device.
The LTM4651 does not feature any specialized output
overvoltage protection beyond what is inherent to the
control loop’s servo mechanism.
RUN Pin Enable
The RUN pin is used to enable the power module or se-
quence the power module. The threshold is 1.2V. The RUN
pincanbeusedtoprovideanundervoltagelockout(UVLO)
function by connecting a resistor divider from the input
supply to the RUN pin, as shown in Figure 3. Undervoltage
lockout keeps the LTM4651 in shutdown until the supply
input voltage is above a certain voltage programmed by
the user. The RUN pin hysteresis voltage prevents noise
from falsely tripping UVLO. Resistors are chosen by first
selecting RB (refer to Figure 3). Then:
RA =RB
VIN(ON)
1.2V
–1


(15)
where VIN(ON) is the input voltage at which the undervolt-
age lockout is overcome and the supply turns on. RA may
be replaced with a hardwired connection from VD to RUN.
The VIN turn-off voltage, VIN(OFF) is given by:
VIN(OFF) =1.07V •
RA
RB
+1


(16)
IfUVLOisnotneeded,RUNcanbeconnectedtoLTM4651’s
VD or VIN pins.
When RUN is below its threshold, UVLO is engaged, MT
and MB are turned off, INTVCC ceases to be regulated,
and ISETa is discharged to SVOUT– by internal circuitry.
Loop Compensation
External loop compensation may be preferred for some
applications and can be implemented easily, as follows:
leave COMPb open circuit; connect a series-RC network
(RTH and CTH) from COMPa to SVOUT–; in some instances,
connect a capacitor (CTHP) from COMPa to SVOUT– (par-
alleling the RTH-CTH series-RC network). See Table 8 for
suggested input and output capacitances for a variety of
operatingconditions.Additionally,theLTpowerCADdesign
tool is available for transient and stability analysis.
APPLICATIONS INFORMATION
Figure 3. Undervoltage Lockout Resistive Divider
RUN PIN
RA
RB
VSUPPLY
4651 F03


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