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參數(shù)資料
| 型號： | LTC3772ETS8#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, PDSO8 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, SOT-23, 8 PIN |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 248K |
| 代理商： | LTC3772ETS8#PBF |
9
LTC3772
3772f
OPERATIO
U
(Refer to the Functional Diagram)
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.
Peak Current Sense Voltage Selection and Slope
Compensation (IPRG Pins)
When a controller is operating below 20% duty cycle, the
peak current sense voltage (between the SENSE+ and SW
pins) allowed across the external P-channel MOSFET is
determined by:
=
V
AV
V
SENSE MAX
ITH
()
(– .
)
–.
07
10
0 015
where A is a constant determined by the state of the IPRG
pins. Floating the IPRG pin selects A = 1.58; tying IPRG to
VIN selects A = 2.2; tying IPRG to SGND selects A = 0.97.
The maximum value of VITHis typically about 1.98V, so the
maximum sense voltage allowed across the external
P-channel MOSFET is 175mV, 100mV or 250mV for the
three respective states of the IPRG pin.
However, once the controller’s duty cycle exceeds 20%,
slope compensation begins and effectively reduces the
peak sense voltage by a scale factor given by the curve in
Figure 1.
The peak inductor current is determined by the peak sense
voltage and the on-resistance of the external P-channel
MOSFET:
I
V
R
PEAK
SENSE MAX
DS ON
=
()
Soft-Start
The start-up of VOUT is controlled by the LTC3772 internal
soft-start. During soft-start, the error amplifier EAMP
compares the feedback signal VFB to the internal soft-start
ramp (instead of the 0.8V reference), which rises linearly
from 0V to 0.8V in about 0.6ms. This allows the output
voltage to rise smoothly from 0V to its final value, while
maintaining control of the inductor current. After the
soft-start is timed out, it is disabled until the part is put in
shutdown again or the input supply is cycled.
Figure 1. Reduction in Sense Voltage Due to
Slope Compensation vs Duty Cycle
DUTY CYCLE (%)
10
SF
=
REDUCTION
IN
SENSE
VOLTAGE
(mV)
60
80
100
90
40
20
50
70
90
30
10
0
30
50
70
20
0
40
60
80
100
3772 F01
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