TS9001-2IJ5 datasheet(6/8 Pages) TOUCHSTONE

Nome de Peças	TS9001-2IJ5

Descrição Electrónicos	1.6V Nanopower Comparator with Internal Reference

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Fabricante Electrônico	TOUCHSTONE [Touchstone Semiconductor Inc]

Página de início	http://www.touchstonesemi.com

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TS9001

Page 6

TS9001DS r1p0

RTFDS

out of the region where oscillation occurs. Figure 2

illustrates the case in which an IN- input is a fixed

voltage and an IN+ is varied. If the input signals

were reversed, the figure would be the same with an

inverted output. To save cost and external pcb area,

an internal 4mV hysteresis circuit was added to the

TS9001-1/2.

Adding Hysteresis to the TS9001-1 Push-pull

Output Option

The TS9001-1 exhibits an internal hysteresis band

(VHYSB) of 4mV. Additional hysteresis can be

generated with three external resistors using positive

feedback as shown in Figure 3. Unfortunately, this

method also reduces the hysteresis response time.

The procedure to calculate the resistor values for the

TS9001-1 is as follows:

1)

Setting R2. As the leakage current at the IN

pin is less than 2nA, the current through R2

should be at least 0.2μA to minimize offset

voltage errors caused by the input leakage

current. The current through R2 at the trip

point is (VREF - VOUT)/R2.

In solving for R2, there are two formulas –

one each for the two possible output states:

R2 = VREF/IR2

or

R2 = (VCC - VREF)/IR2

From the results of the two formulae, the

smaller of the two resulting resistor values is

chosen. For example, when using the

TS9001-1 (VREF = 1.252V) at a VCC = 3.3V

and if IR2 = 0.2μA is chosen, then the

formulae above produce two resistor values:

6.26MΩ and 10.24MΩ - the 6.2MΩ standard

value for R2 is selected.

2)

Next, the desired hysteresis band (VHYSB) is

set. In this example, VHYSB is set to 100mV.

3)

Resistor R1 is calculated according to the

following equation:

R1 = R2 x (VHYSB/VCC)

and substituting the values selected in 1)

and 2) above yields:

R1 = 6.2MΩ x (100mV/3.3V) = 187.88kΩ.

The 187kΩ standard value for R1 is chosen.

4)

The trip point for VIN rising (VTHR) is chosen

such that VTHR > VREF x (R1 + R2)/R2 (VTHF

is the trip point for VIN falling). This is the

threshold voltage at which the comparator

switches its output from low to high as VIN

rises above the trip point. In this example,

VTHR is set to 3V.

5)

With the VTHR from Step 4 above, resistor R3

is then computed as follows:

R3 = 1/[VTHR/(VREF x R1) - (1/R1) - (1/R2)]

R3 = 1/[3V/(1.252V x 187kΩ)

- (1/187kΩ) - (1/6.2MΩ)] = 136.9kΩ

In this example, a 137kΩ, 1% standard

value resistor is selected for R3..

Figure 3

: Using Three Resistors Introduces

Additional Hysteresis in the TS9001-1.

Figure 2

: TS9001 Threshold Hysteresis Band

Nº de peça semelhante - TS9001-2IJ5

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Silicon Laboratories	TS9001-2IJ5	1Mb / 15P	1.6V Nanopower Comparator with Internal Reference
	TS9001-2IJ5	1Mb / 15P	1.6V Nanopower Comparator with Internal Reference
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Descrição semelhante - TS9001-2IJ5

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