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BIT3251 데이터시트 PDF




Beyond Innovation Technology에서 제조한 전자 부품 BIT3251은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 BIT3251 기능
기능 Low Cost PWM Controller
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BIT3251 데이터시트, 핀배열, 회로
DataSheet.in
Beyond Innovation Technology Co., Ltd.
BIT3251
BIT3251
Low Cost PWM Controller
Version: A0
Please read the notice stated in this preamble carefully
before accessing any contents of the document attached.
Admission of BiTEK’s statement therein is presumed once
the document is released to the receiver.
碩頡科技 BiTEK
May 16, 2007
DCC CONTROLLED
2006/7/7
Confidential, for authorized user only
page 1 of 7
DOC NO.W-DS-0034




BIT3251 pdf, 반도체, 판매, 대치품
DataSheet.in
Beyond Innovation Technology Co., Ltd.
Pin Description:
BIT3251
Pin No.
1
2
3
4
5
6
7
8
Names
VDD
EA
CMP
INN
OVP
NC
GND
OUT
Description
Supply voltage input.
Enable Control Pin
The output of the error amplifier. CMP is force to low when VDD < 3.6V.
PWM controller input, the inverting input of error amplifier. INN is pulled high to
reduce the CMP when VDD < 3.6V
Over Voltage detection pin
No Connection
Ground
Output pin
Function Description:
The PWM Controller: The pulse width modulation
control circuit includes a ramp wave generator, an error
amplifier and a comparator. These devices provide
the required active components for the PWM feedback
control application. The inverting input of the error
amplifier is pulled high to reduce its output CMP when
VDD<3.6V. The maximum duty cycle of the PWM
controller is limited to 93%
The Over Voltage Protection: The converter output
voltage will boost too high when the LEDs are
disconnected from the circuit or fail open. The BIT3251
will latch off the output if the OVP pin senses a voltage
that is larger than 1.5V. The latched off status can be
reset by reducing the supply voltage to lower than 3.6V.
UVLO: The Under-Voltage-Lock-Out circuit turns the
output driver off when supplying voltage drops to less
than 3.6V
Enable Control: When V(EA) is1.2V, the BIT3251 is
enabled. When V(EA) is0.8V, the BIT3251 enter into
shutdown mode operation. The BIT3251 has an
internal 80K±15% ohm pull low resistor on the EA pin,
thus the device is normally in the OFF state or
shutdown mode operation.
Initial Setting: System will have a fast transition
response by setting a suitably initial voltage. The
BIT3251 will set an initial voltage of Vinn and Vcmp
under below conditions.
Table 1. Initial setting Voltage
Voltage Setting(@5V)
VEA
VINN =0.68V, VCMP =0.53V VEA > 1.2V
VINN =0.68V, VCMP =0.53V VEA < 0.8V
VINN =0.68V, VCMP =0.53V VEA > 1.2V
Setting Equation
VINN =0.68V+0.12V*(VDD-5)
VCMP =0.53V+0.08V*(VDD-5)
VDD
VOVP
VDD < 3.6V VOVP < 1.5V
VDD > 4.0V VOVP < 1.5V
VDD > 4.0V VOVP > 1.5V
(1)
(2)
Vinn
Vcmp
Vcmp
Vinn=0.2V
Initial start up time
Figure 1. Initial transition response
(VDD=5V, VINN =0.68V, VCMP =0.53V)
碩頡科技 BiTEK
May 16, 2007
DCC CONTROLLED
2006/7/7
Confidential, for authorized user only
page 4 of 7
DOC NO.W-DS-0034

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BIT3251 전자부품, 판매, 대치품
DataSheet.in
Beyond Innovation Technology Co., Ltd.
Order Information:
BIT3251-SO
SO: SOP
Part number
Beyond Innovation Technology Co., Ltd.
Package Information :
SOP type :
BIT3251
Unit: mm
2006/7/7
碩頡科技 BiTEK
May 16, 2007
DCC CONTROLLED
Confidential, for authorized user only
page 7 of 7
DOC NO.W-DS-0034

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