S-8333CBHC-T8T1y datasheet(17/44 Pages) SII

No. de pieza	S-8333CBHC-T8T1y

Descripción Electrónicos	STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER

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Fabricante Electrónico	SII [Seiko Instruments Inc]

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17 / 44 page

STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER

Rev.4.2_01

S-8333 Series

17

5. Oscillation frequency and maximum duty ratio setting resistors (ROSC, RDuty)

With the S-8333 Series, the oscillation frequency can be set in a range of 280 kHz to 1.08 MHz using external

resistance. Connect a resistor across the ROSC and VSS pins. Select the resistor by using the following

equation and referring to Figure 12. However, the following equation and figure assume that the resistance

value is the desired value and show the theoretical values when the IC is in the typical conditions. Note that

fluctuations of resistance and IC are not considered.

130

× 10

3

ROSC [k

Ω] ≅

fOSC [kHz]

1400

1200

1000

800

600

400

200

0

200

400

600

ROSC [k

Ω]

Figure 12 ROSC vs. fOSC

With the S-8333 Series, the maximum duty ratio can be set in a range of 47% to 88.5% (between 47 to 80%, if the

oscillation frequency is less than 500 kHz) by an external resistor. Connect the resistor across the RDuty and

VSS pins. Select the resistance by using the following equation and referring to Figure 13. The maximum duty

ratio fluctuates according to the oscillation frequency. If the value of ROSC is changed, therefore, be sure to

change the value of RDuty so that it is always in proportion to RDuty / ROSC. However, the following equation

and figure assume that the resistance value is the desired value and show the theoretical values when the IC is

in the typical conditions. Note that fluctuations of resistance and IC are not considered.

Caution Set max. duty 80% or less if the oscillation frequency is less than 500 kHz.

(95.5

− MaxDuty)

≅

ROSC

RDuty

15.0

100

90

80

70

60

50

40

0

2

4

RDuty / ROSC

1

3

Figure 13 RDuty / ROSC vs. MaxDuty

Connect resistors ROSC and RDuty as close to the IC as possible.

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S-8333CBHC-T8T1y Datasheet(PDF) 17 Page - Seiko Instruments Inc

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