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参数资料
| 型号： | LM5655VB |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | 0.225 INCH, SSOP-24 |
| 文件页数： | 8/9页 |
| 文件大小： | 113K |
| 代理商： | LM5655VB |
LV5655VB
No.A1362-8/9
Notes
(1) Soft start time setting method
The soft start time is set with the capacitor connected between CSOFT* and GND_S.
This IC has an independent soft start function for each channel, so a capacitor must be connected for each CSOFT to
set the soft start time.
(Description of soft start operation)
(Outline of soft start pin)
(2) Setting the oscillation frequency
The oscillation frequency is set by the resistor (RT resistor) connected to the RT pin.
The RT pin is a constant voltage (0.56 [V] typ.) output, and the oscillation frequency is determined by the current run
through the RT resistor and charging/discharging of the internal capacitor.
fOSC [kHz] =
12 × 1E3
RT [k
]
(Reference calculation formula)
The internal oscillation frequency deviates from the calculated value due to overshoot, undershoot and other factors,
so the frequency should be confirmed in an actual set.
(3) SCP (short circuit protection) function
Description of operation
When any one of FB1 to FB4 goes High due to the load being shorted or other reason, charging to the SCP pin starts.
If output does not recover during the set time Tscp and SCP pin voltage exceeds the threshold voltage, the protective
circuit (SCP) operates and all channel outputs are turned OFF. All outputs are latched off by the protection circuit
(SCP). This latched state (output OFF) is canceled by setting the CTL pin Low or by turning the power supply OFF.
When not using the protection function (SCP), the SCP pin must be shorted to GND_S with a line that is as short as
possible.
The SCP operation time is set by the capacitor connected to the SCP pin.
(SCP charging operation)
(SCP function)
VREG
(Internal constant
voltage)
VB (0.515[V])
200k
(RSF)
CSOFT*
4
A (ISF)
GND_S
VB
RSF × ISF
TSOFT = CSOFT × RSFIn (
)
= 0.206
× 106 × CSOFT [s]
CSOFT* [V]
CSOFT* voltage
T [s]
VB (=0.515 [V] (TYP))
CSOFT pin charging starts
The output voltage reaches the set voltage
(Output voltage constant)
Soft start time (Tsoft [s])
SCP
CTL
Each output
Threshold voltage
1.25V (TYP)
Output ON
(Operating condition)
Time
Output OFF
Capacitor charging starts
with the load being shorted
SCP [V]
T [s]
tscp
SCP operation
Charging with Iscp = 4 [
A]
Output short circuit
1.25 [V]
(TYP)
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