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參數(shù)資料
| 型號： | LTC3783IDHD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 5 X 4MM, PLASTIC, MO-229WJGD-2, DFN-16 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 250K |
| 代理商： | LTC3783IDHD |
LTC3783
13
3783fb
OPERATION
For applications where the RUN pin is only to be used as
a logic input, the user should be aware of the 7V Absolute
Maximum Rating for this pin! The RUN pin can be con-
nected to the input voltage through an external 1M resistor,
as shown in Figure 5c, for “always on” operation.
Soft-Start Capacitor Selection
For proper soft-start operation, the LTC3783 should have
a sufciently large soft-start capacitor, CSS, attached to
the SS pin. The minimum soft-start capacitor size can be
estimated on the basis of output voltage, capacitor size
and load current. In addition, PWM operation reduces the
effective SS capacitor value by the dimming ratio.
C
gratio
A C
V
R
SS MIN
OUT
DS
()
(
dimmin
>
μ
250
O
ON SENSE
mV
V
)/
.
150
1 2
assuming 50% ripple current, where RDS(ON)/SENSE
represents either the RDS(ON) of the switching MOSFET
or RSENSE, whichever is used on the SENSE pin. Dimming
ratio is described by 1/DPWM as shown in Figure 6.
Application Circuits
A basic LTC3783 PWM-dimming LED application is shown
on the rst page of this data sheet.
Operating Frequency and PWM Dimming Ratio
Theminimumoperatingfrequency,fOSC,requiredforproper
operation of a PWM dimming application depends on the
minimumPWMfrequency,fPWM,thedimmingratio1/DPWM,
and N, the number of fOSC cycles per PWM cycle:
f
Nf
D
OSC
PWM
>
–
+
RUN
COMPARATOR
VIN
RUN
R2
R1
INPUT
SUPPLY
OPTIONAL
FILTER
CAPACITOR
+
–
GND
3783 F05a
BIAS AND
START-UP
CONTROL
1.248V
μPOWER
REFERENCE
6V
Figure 5a. Programming the Turn-On and Turn-Off Thresholds Using the RUN Pin
–
+
RUN
COMPARATOR
1.248V
3483 F05b
RUN
6V
EXTERNAL
LOGIC CONTROL
Figure 5b. On/Off Control Using External Logic
–
+
RUN
COMPARATOR
VIN
RUN
R2
1M
INPUT
SUPPLY
+
–
GND
1.248V
3483 F05c
6V
Figure 5c. External Pull-Up Resistor on
RUN Pin for “Always On” Operation
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