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step-up converter. BIT3269 Datasheet

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step-up converter. BIT3269 Datasheet






BIT3269 converter. Datasheet pdf. Equivalent




BIT3269 converter. Datasheet pdf. Equivalent





Part

BIT3269

Description

White LED step-up converter



Feature


Beyond Innovation technology Co., Ltd. BIT3269 White LED step-up converter Ve rsion: A1 2012/02/09 Confidential Thi s is an ONE-TIME copy. Updates will not be provided page 1 of 6 Beyond Innov ation technology Co., Ltd. Features: Dr ives up to 27 LEDs from a 5V supply 36V power switch Current mode control 650m A current limitation Fast 1.3MHz switch ing frequency SOT-.
Manufacture

Beyond Innovation Technology

Datasheet
Download BIT3269 Datasheet


Beyond Innovation Technology BIT3269

BIT3269; 236 package Pin Layout: 1 SW 2 GND 3 FB BIT3269 Vin OVP /SHDN 6 5 4 Genera l Description: BIT3269 integrated circu it provides essential PWM features for white LED driver. It can drive up to 27 LEDs from a 5V supply. BIT3269 built-i n 36V power switch with current mode co ntrol provides fast response. There is an internal 650mA current detection can provide the prote.


Beyond Innovation Technology BIT3269

ction of internal switch. Due to 1.3MHz operation frequency, BIT3269 can reduce the size of external inductor and capa citor. All the functions are combined i n a small SOT-236 package. Typical appl ication: Recommended Operating Conditi on: Supply voltage .


Beyond Innovation Technology BIT3269

.

Part

BIT3269

Description

White LED step-up converter



Feature


Beyond Innovation technology Co., Ltd. BIT3269 White LED step-up converter Ve rsion: A1 2012/02/09 Confidential Thi s is an ONE-TIME copy. Updates will not be provided page 1 of 6 Beyond Innov ation technology Co., Ltd. Features: Dr ives up to 27 LEDs from a 5V supply 36V power switch Current mode control 650m A current limitation Fast 1.3MHz switch ing frequency SOT-.
Manufacture

Beyond Innovation Technology

Datasheet
Download BIT3269 Datasheet




 BIT3269
Beyond Innovation technology Co., Ltd.
BIT3269
White LED step-up converter
Version: A1
2012/02/09
Confidential
This is an ONE-TIME copy. Updates will not be provided
page 1 of 6




 BIT3269
Beyond Innovation technology Co., Ltd.
Features:
Drives up to 27 LEDs from a 5V supply
36V power switch
Current mode control
650mA current limitation
Fast 1.3MHz switching frequency
SOT-236 package
Pin Layout:
1 SW
2 GND
3 FB
BIT3269
Vin
OVP
/SHDN
6
5
4
General Description:
BIT3269 integrated circuit provides essential
PWM features for white LED driver. It can drive
up to 27 LEDs from a 5V supply. BIT3269 built-in
36V power switch with current mode control
provides fast response. There is an internal
650mA current detection can provide the
protection of internal switch. Due to 1.3MHz
operation frequency, BIT3269 can reduce the size
of external inductor and capacitor. All the
functions are combined in a small SOT-236
package.
Typical application:
Recommended Operating Condition:
Supply voltage………………………….2.5V ~ 8V
Max. SW voltage………...…………….36V
Operating Ambient Temperature…..... -20   C ~ 85   C
Operating Frequency (typ.)………......1.3MHz
Absolute Ratings
Supply Voltage……………………………10V
Operating Ambient Temperature…….....-20   C ~ 85   C
Operating Junction Temperature…….....+125   C
Storage Temperature……………………..-55   C ~ 150   C
2012/02/09
Confidential
This is an ONE-TIME copy. Updates will not be provided
page 2 of 6




 BIT3269
Beyond Innovation technology Co., Ltd.
Functional Block Diagram:
BIT3269
OVP
Pin Description:
Pin No.
1
2
3
4
5
6
Symbol
SW
GND
FB
/SHDN
OVP
Vin
I/O Descriptions
I
Switch Pin.
(Minimize trace area at this pin to reduce EMI.)
I/O
Ground Pin.
(Connect directly to local ground plane.)
I
Feedback Pin. Reference voltage is 95 mV.
(Calculate resistor value according to the formula: RFB=95 mV / ILED.)
O
Shutdown Pin.
(Connect to 1.5 V or higher to enable device; 0.4 V or less to disable device.)
I Over voltage protection.
I/O Input Supply Pin.
Functional Description:
OPERATION
The BIT3269 uses a constant frequency, current mode control
scheme to provide excellent line and load regulation. Please
refer the functional block diagram, at the start of each
oscillator cycle, the SR latch is set, which turns on the power
switch Q1. A voltage proportional to the switch current is
added to a stabilizing ramp and the resulting sum is fed into
the positive terminal of the PWM comparator A2. When this
voltage exceeds the level at the negative input of A2, the SR
latch is reset turning off the power switch. The level at the
negative input of A2 is set by the error amplifier A1, and is
simply an amplified version of the difference between the
feedback voltage and the reference voltage of 95mV. In this
manner, the error amplifier sets the correct peak current level
to keep the output in regulation. If the error amplifier’s output
increases, more current is delivered to the output; if it
decreases, less current is delivered.
2012/02/09
Confidential
This is an ONE-TIME copy. Updates will not be provided
page 3 of 6



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