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PDF BIT3267 Data sheet ( Hoja de datos )
| Número de pieza | BIT3267 | |
| Descripción | High Performance PWM Controller | |
| Fabricantes | Beyond Innovation Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BIT3267 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Beyond Innovation Technology Co., Ltd.
High Performance PWM Controller
Version: A3
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.
2013/01/06
Confidential
This is an ONE-TIME copy. Updates will not be provided
page 1 of 8
1 page  
Beyond Innovation Technology Co., Ltd.
Pin description:
Pin No.
1
2
3
4
5
6
7
8
Symbol
OUT
GND
OCP
OVP
INN
CMP
EA
VDD
Descriptions
Output pin
Ground pin
Over current protection and frequency selection
Over voltage protection
The inverting input of the error amplifier
Output of the error amplifier
Enable pin
Power supply
Functional description:
Under voltage locked out, UVLO:
The Under-voltage lockout turns-off BIT3267 if the input
voltage drops below the under-voltage lockout threshold. It
turns-on BIT3267 if the input voltage is higher than its
threshold. The hysteresis voltage is about 1V.
0.21V
INN
+
-
CMP
Enable control
The EA pin controls the state of BIT3267. When EA ¥ 2V,
BIT3267 is enabled. And EA ¦ 0.8V, BIT3267 is disabled.
RL ED
LED current regulation
Please refer following figure, a resistor RS is connected serial
with LED string that can sense LED current. This sensed LED
current signal feeds to INN pin and compares with its internal
reference voltage of the error amplifier. The error amplifier
outputs an error signal to control LED current.
The LED current is controlled as following equation:
I LED
=
0.21
RLED
Frequency selection and over current protection
BIT3267 sets its operation frequency and over current
protection in its OCP pin. In the initial state, the resistor
connected in the OCP pin can select different output
frequency. The selection table is as following:
FREQ resistor
1k £
10k £
22§¨£
Frequency
55kHz
110kHz
220kHz
When BIT3267 enters normal operation mode OCP and
detects the external MOSFET current.
2013/01/06
Confidential
This is an ONE-TIME copy. Updates will not be provided
page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BIT3267.PDF ] | |
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