參數(shù)資料
型號(hào)： LTC4110EUHF#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38
封裝： 5 X 7 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WHKD, QFN-38
文件頁(yè)數(shù)： 30/52頁(yè)
文件大?。?/td> 450K
代理商： LTC4110EUHF#TR
LTC4110
36
4110fb
to monitor the primary current in both sides with a single
RSNS(FET) resistor, both transformer windings must be
connected prior to RSNS(FET). Since the secondary phase
is always 180 degrees out of phase with the primary, the
following current waveform in Figure 14 is the result.
APPLICATIONS INFORMATION
IPRI
SECONDARY CURRENT
PRIMARY CURRENT
IPRI
N
0
4110 F14
Figure 14. RSNS(FET) Current Waveform
in calibration mode input current is regulated, not the
output current.
The LTC4110’s ISENSE pin has a limited usable positive
voltage range for VSNS(FET). The range must be between
30mV and 150mV peak in both charge and calibration
modes when operating at full current. The negative portion
of the waveform is also monitored but has a dynamic trip
level that tracks the actual primary current. The trip level
has a gain factor of –3. If the secondary current trips the
negative level, the yback goes into current limit.
These limits have the following implications:
The ratio of peak current between IPRI(CHG) and IPRI(CAL)
cannot be greater than 5-to-1 as seen by RSNS(FET).
The transformer turns ratio will approximately reduce
the maximum available DC current ratio between ICHG
to ICAL by a factor of 1/N. The additional variables
being ripple current and efciency.
You cannot use a transformer with a turns ratio
greater than 3.
Because efciency is always less than 100%, you
never have to worry about peak secondary current
causing a false short circuit trip within the turns ratio
limit of 3 or less.
As a design starting point, use the lowest value between
IPRI(CHG) and IPRI(CAL) for IPRI, let VSNS(FET) be set to 50mV
for good efciency and solve for RSNS(FET).
R
V
I
SNS FET
PRI
()
=
With an initial value of RSNS(FET) identied, solve for
VSNS(FET) using the highest value between IPRI(CHG) or
IPRI(CAL) and see if the calculated value of VSNS(FET) falls
below the upper limits. If it is too high, you may have to
drop the value of RSNS(FET).IfyoucannotmeettheVSNS(FET)
upper or lower limits and/or ratio limits, you may have to
back off on one of the ICHG and ICAL DC current parameters
to compensate.
Once within all the limits, optimize RSNS(FET) for maximum
efciency by using very low value of RSNS(FET) and/or nd
a popular RSNS(FET) value. The tradeoff of using lower
values of RSNS(FET) is increased waveform jitter due to
higher switching noise sensitivity issues.
In terms of current sensing, the primary current portion
of the above waveform is monitored for peak current (DC
+ AC) at any time in any mode. It does not monitor the
batteries’ DC current. The LTC4110 uses leading edge
blanking to mask out noise to make the application of this
part simple to use. The secondary portion of the above
waveform is monitored for negative peak current to sense
for short circuit.
The value of ripple current, ΔI, is a direct function of the
transformer inductance. See transformer section for more
information about transformer ripple current.
You must calculate the IPRI for both charge current mode
and calibration current mode. The equation for calculating
the IPRI for charge mode is as follows:
IPRI(CHG) =
ICHG
E
VBAT
VDCIN
+ N +
VBAT VDCIN
2 f LPRI VBAT + N VDCIN
(
)
(1)
IPRI for the Calibration mode is as follows:
IPRI(CAL) = ICAL
VBAT
N VDCIN
+ 1 +
VBAT VDCIN
2 f (N2 LPRI) VDCIN +
VBAT
N
(2)
The value of E is the yback efciency. Use 80% (0.8) as
the value since the yback uses synchronous rectica-
tion. E is not used for the calibration equation because
相關(guān)PDF資料
PDF描述
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