TYPICAL I
參數(shù)資料
型號: DC1562A-H
廠商: Linear Technology
文件頁數(shù): 11/26頁
文件大?。?/td> 0K
描述: BOARD EVAL LTC6993-2
設(shè)計(jì)資源: DC1562A Design Files
DC1562A Schematic
特色產(chǎn)品: TimerBlox?
標(biāo)準(zhǔn)包裝: 1
系列: TimerBlox®
主要目的: 定時(shí),單穩(wěn)多諧振蕩器
嵌入式:
已用 IC / 零件: LTC6993-2
主要屬性: 上升沿觸發(fā)器,可再觸發(fā)
次要屬性: 2.25 V ~ 5.5 V 電源
已供物品:
LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
19
69931234fb
APPLICATIONS INFORMATION
Table 2. Typical Supply Current
CONDITION
TYPICAL IS(IDLE)
TYPICAL IS(ACTIVE)*
NDIV ≤ 64
V+ NDIV 7pF + 4pF
(
)
tOUT
+
V+
500k
+ 2.2ISET +50A
V+
Duty Cycle
tOUT
NDIV 5pF +18pF +CLOAD
(
)
NDIV ≥ 512
V+ NDIV 7pF
tOUT
+
V+
500k
+1.8 ISET +50A
V+
Duty Cycle
tOUT
CLOAD
*Ignoring resistive loads (assumes RLOAD = ∞)
Power Supply Current
The Electrical Characteristics table specifies the supply
current while the part is idle (waiting to be triggered).
IS(IDLE) varies with the programmed tOUT and the supply
voltage. Once triggered, the instantaneous supply current
increases to IS(ACTIVE) while the timing circuit is active.
IS(ACTIVE) = IS(IDLE) + IS(ACTIVE)
The average increase in supply current
IS(ACTIVE) de-
pends on the output duty cycle (or negative duty cycle,
if POL = 1), since that represents the percentage of time
that the circuit is active. IS(IDLE) and IS(ACTIVE) can be
estimated using the equations in Table 2.
Figure 12 shows how the supply current increases from
IS(IDLE) as the input frequency increases. The increase is
smaller at higher NDIV settings.
DUTY CYCLE (%)
IDLE
POWER
SUPPL
YCURRENT
(A)
150
200
250
80
69931234 F12
100
50
0
20
40
60
100
V+ = 3.3V
DUTY CYCLE = fIN tOUT
÷1, RSET = 50k
÷8, RSET = 50k
÷1, RSET = 100k
÷1, RSET = 800k
CLOAD = 5pF
RLOAD = ∞
Figure 12. IS(ACTIVE) vs Output Duty Cycle
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