BIT3193 데이터 시트보기 (PDF) - Unspecified

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BIT3193

High Performance PWM Controller

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Beyond Innovation Technology Co., Ltd.

BIT3193

LOAD Resistor VS. CTOSC Frequency Deviation

200.00

175.00

150.00

125.00

100.00

75.00

50.00

25.00

0.00

0

173.30

151.10

CTOSC=100KHz

126.50

108.70

91.40

76.20

63.50

54.40

45.70

38.70 32.10

26.80

20

40

60

80

100

LOAD Resisor (Kohm)

Fig.6

Then the frequency deviation can be calculated as

Equation (2)

∆Fn = ∆F100KHz × Fn .............(2)

100KHz

Setting the Frequency of Low Frequency PWM

Generator: An internal trimmed low frequency

oscillator generates a ± 3% accurate frequency on

CTPWM pin with external capacitors. The capacitor

values versus operation frequencies are as bellow:

[ ] FLFPWM

=

4512

.............(3)

CCTPWM + 0.005 nF

Note: Above equation (3) is valid only when operating

frequency is between 150Hz ~ 1.5KHz

The logic high output of pin PWMOUT is made by an 2.5V

DC voltage and the floating state makes the logic low

portion. MODSEL pin provides the polarity selection of

LF_PWM generator. If MODSEL pin is 0V, a 0% duty cycle

is obtained when PWMDC < 1.0V. If this pin is pulled to

IC VDD level, 0% duty cycle is obtained while PWMDC>

2.5V.

Note: BIT3193 limits the maximum duty cycle to ~ 92 %.

PWMOUT sends the pulses when ISEN >1.3V or TIMER

>2.5V.

UVLO: The under-voltage-lookout circuit turns the output

driver off when supply voltage drops too low. Whole

system includes the protection and timing circuits are reset

(pin TIMER =0) in low VDD state.

DC/AC Characteristics:

Absolute Ratings:

Table 3

Parameter

Symbol Ratings

Unit Remarks

Supply Voltage

VDD -0.3~+ 9

V

Ground

GND ±0.3

V Ta=25°C

Input pin Voltage

-0.3~ VDD+0.3 V

Operating Ambit Temperature Ta

0~ +70

°C

Operating Junction Temperature

+150

°C

Storage Temperature

-55~+150

°C

DC/AC Characteristics

04/11/08

Confidential, for authorized user only

page 5 of 10

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