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參數(shù)資料
| 型號(hào)： | LTC3801ES6#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | MO-193, PLASTIC, TSOT-23 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 229K |
| 代理商： | LTC3801ES6#PBF |
6
LTC3801/LTC3801B
sn3801 3801fs
VIN = 4.2V
5
s/DIV
3801 F01a
VOUT= 2.5V
IOUT = 100mA
OPERATIO
U
(Refer to the Functional Diagram)
Undervoltage Lockout Protection
To prevent operation of the external P-channel MOSFET
with insufficient gate drive, an undervoltage lockout cir-
cuit is incorporated into the LTC3801/LTC3801B. When
the input supply voltage drops below approximately 1.7V,
the P-channel MOSFET and all internal circuitry other than
the undervoltage block itself are turned off. Input supply
current in undervoltage is approximately 1
A.
Short-Circuit Protection
If the output is shorted to ground, the frequency of the
oscillator is folded back from 550kHz to approximately
210kHz while maintaining the same minimum on time.
VOUT Ripple for Front Page Circuit Using the LTC3801
(with Burst Mode Operation)
VOUT Ripple for Front Page Circuit Using the LTC3801B
(Burst Mode Operation Disabled)
20mVAC/DIV
VIN = 4.2V
5
s/DIV
3801 F01b
VOUT= 2.5V
IOUT = 100mA
20mVAC/DIV
Figure 1. Output Ripple Waveforms for the Front Page Circuit
LOAD CURRENT (mA)
0.1
10
1
70
EFFICIENCY
(%)
75
80
85
90
100
1000
10000
3801 F02
65
60
55
50
95
100
VOUT = 2.5V
VIN = 3.3V
VIN = 4.2V
VIN = 6.6V
VIN = 9.8V
VIN = 8.4V
Figure 2. LTC3801B Efficiency vs Load Current
This lower frequency allows the inductor current to safely
discharge, thereby preventing current runaway. After the
short is removed, the oscillator frequency will gradually
increase back to 550kHz as VFB rises through 0.3V on its
way back to 0.8V.
Overvoltage Protection
If VFB exceeds its regulation point of 0.8V by more than
10% for any reason, such as an output short circuit to a
higher voltage, the overvoltage comparator will hold the
external P-channel MOSFET off. This comparator has a
typical hysteresis of 40mV.
Slope Compensation and Inductor’s Peak Current
The switch on duty cycle in normal operation is given by:
Duty
V
VV
D
IN
D
Cycle =
VOUT +
+
where VD is the forward voltage drop of the external diode
at the average inductor current. For duty cycles less than
40%, the inductor’s peak current is determined by:
I
VV
R
MAX
ITH RUN
SENSE
=
/
–.
07
10
However, for duty cycles greater than 40%, slope com-
pensation begins and effectively reduces the peak
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