BIT3713 查看數據表（PDF） - Unspecified

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BIT3713

High Performance PWM Controller

Unspecified 

Beyond Innovation Technology Co., Ltd.

CTOSC=100KHz

Fig.2

Then the frequency deviation can be calculated as

Equation (2)

Fn

F100KHz

100KHz

Fn

.............(2)

BIT3713

Setting the Frequency of the 2nd Low Frequency

PWM Generator: A 2nd 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

CCTPWM 0.005

nF

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

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 a 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: BIT3713 limits the maximum duty cycle to about 92

%. PWMOUT sends the pulses when ISEN >1.3V or

TIMER >2.5V.

UVLO: The under-voltage-lockout 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

Supply Voltage

Ground

Input pin Voltage

Operating Ambit Temperature

Operating Junction Temperature

Storage Temperature

Symbol

VDD

GND

Ta

Ratings

-0.3~+ 8.8

±0.3

-0.3~ VDD+0.3

-20 ~ +85

+150

-55~+150

Unit Remarks

V

V Ta=25°C

V

C

C

C

BiTEK

December 20, 2005

DCC CONTROLLED

‘05/12/15

Preliminary

Confidential, for authorized user only

page 6 of 11

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