LTC6993C 데이터 시트보기 (PDF) - Linear Technology

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LTC6993C

TimerBlox: Monostable Pulse Generator (One Shot)

Linear Technology 

APPLICATIONS INFORMATION

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.

Table 2. Typical Supply Current

CONDITION

TYPICAL IS(IDLE)

NDIV ≤ 64

( ) V+ •

NDIV • 7pF + 4pF

tOUT

+

V+

500kΩ

+

2.2

• ISE T

+

50µA

NDIV ≥ 512

V+

• NDIV

tOUT

• 7pF

+

V+

500kΩ

+ 1.8

• ISE T

+

50µA

*Ignoring resistive loads (assumes RLOAD = ∞)

LTC6993-1/LTC6993-2

LTC6993-3/LTC6993-4

250 V+ = 3.3V

DUTY CYCLE = fIN • tOUT

200

÷1, RSET = 50k

150

÷8, RSET = 50k

÷1, RSET = 100k

100

÷1, RSET = 800k

50

CLOAD = 5pF

RLOAD = ∞

0

IDLE 20

40

60

DUTY CYCLE (%)

80 100

69931234 F12

Figure 12. IS(ACTIVE) vs Output Duty Cycle

TYPICAL ∆IS(ACTIVE)*

( ) V+

• Duty Cycle •

tOUT

NDIV

• 5pF + 18pF + CLOAD

V+

•

Duty Cycle

tOUT

• CLOAD

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