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參數(shù)資料
| 型號(hào)： | LT3800 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 240K |
| 代理商： | LT3800 |
LT3724
11
3724f
Soft-Start
The soft-start function controls the slew rate of the power
supply output voltage during start-up. A controlled output
voltage ramp minimizes output voltage overshoot, re-
duces inrush current from the V
IN
supply, and facilitates
supply sequencing. A capacitor, C
SS
, connected between
V
OUT
of the supply and the C
SS
pin of the IC, programs the
slew rate. The capacitor provides a current to the C
SS
pin
which is proportional to the dV/dt of the output voltage.
The soft-start circuit overrides the control loop and ad-
justs the inductor current until the output voltage slew rate
yields a 2
μ
A current through the soft-start capacitor. If the
current is greater than 2
μ
A, then the current threshold set
by the DC control voltage, V
C
, is decreased and the
inductor current is lowered. This in turn lowers the output
current and the output voltage slew rate is decreased. If the
current is less than 2
μ
A, then the current threshold set by
the DC control voltage, V
C
, is increased and the inductor
current is raised. This in turn increases the output current
and the output voltage slew rate is increased. Once the
output voltage is within 5% of its regulation voltage, the
soft-start circuit is disabled and the main control regulates
the output. The soft-start circuit is reactivated when the
output voltage drops below 70% of its regulation voltage.
Slope/Antislope Compensation
The IC incorporates slope compensation to eliminate
potential subharmonic oscillations in the current control
loop. The IC’s slope compensation circuit imposes an
OPERATIOU
(Refer to Functional Diagram)
artificial ramp on the sensed current to increase the rising
slope as duty cycle increases.
Unfortunately, this additional ramp typically affects the
sensed current value, thereby reducing the achievable
current limit value by the same amount as the added ramp
represents. As such, the current limit is typically reduced
as the duty cycle increases. The LT3724, however, con-
tains antislope compensation circuitry to eliminate the
current limit reduction associated with slope compensa-
tion. As the slope compensation ramp is added to the
sensed current, a similar ramp is added to the current limit
threshold. The end result is that the current limit is not
compromised so the LT3724 can provide full power re-
gardless of required duty cycle.
Shutdown
The LT3724 includes a shutdown mode where all the
internal IC functions are disabled and the V
IN
current is
reduced to less than 10
μ
A. The shutdown pin can be used
for undervoltage lockout with hysteresis, micropower
shutdown or as a general purpose on/off control of the
converter output. The shutdown function has two thresh-
olds. The first threshold, a precision 1.23V threshold with
120mV of hysteresis, disables the converter from switch-
ing. The second threshold, approximately a 0.7V refer-
enced to SGND, completely disables all internal circuitry
and reduces the V
IN
current to less than 10
μ
A. See the
Application Information section for more information.
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