900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






PowTech

PT4112 Datasheet Preview

PT4112 Datasheet

WLED Driver

No Preview Available !

PT4112
WLED Driver for Notebook Display
GENERAL DESCRIPTION
The PT4112 is a step-up converter with current sources
capable of driving six parallel strings of up to 10
series-connected WLEDs. Each string is terminated
with ballast that achieves ±1.5% current regulation
accuracy, ensuring even brightness for all WLEDs. The
PT4112 generates an output voltage to drive up to
totally 60 WLEDs from a 5V to 25V input source; in
addition, the output voltage is automatically adjusted to
WLED forward voltage to achieve good efficiency.
The PT4112 supports pulse width modulation (PWM)
brightness dimming. A PWM signal input on the BRT
pin could directly turn LED lights on/off. By freezing
the circuit state during dimming off stage, the AC ripple
on output ceramic capacitors is minimized across a
wide duty cycle range; therefore reduce the potential
audible noise.
The PT4112 has multiple features to protect itself from
fault conditions including built-in open lamp over
voltage protection, cycle-by-cycle current limit, over
temperature shutdown, input under voltage lock out and
integrated soft-start. Additionally, PT4112 provides a
driver output for an external PFET connected between
the input and inductor. The PFET will be turned off by
PT4112 to disconnect the battery from the WLEDs
when severe error happens thus any leakage current of
the battery is prevented.
TYPICAL APPLICATIONS
FEATURES
z 5V to 25V wide input voltage range
z 1.2MHz switch frequency with dithering
z Integrated 1.5A 40V MOSFET
z Six-channel current sink adjustable from 15mA to
25mA
z ±1.5% current accuracy between strings
z 100:1 PWM dimming range
z Boost output voltage auto-adjust to maximum
forward voltage LED string
z Small external components
z Cycle by cycle current limiting
z Built in soft start
z Open/Short lamp self protection
z Current auto-adjust when open lamp detected
z Drive for input/output isolation PFET
z 16 pin 3×3 QFN pakage
APPLICATIONS
z Notebook LCD display Backlight
z General middle-sized LCD backlight
PT4112_DSB Rev EN_0.1
www.micro-bridge.com
Page 1




PowTech

PT4112 Datasheet Preview

PT4112 Datasheet

WLED Driver

No Preview Available !

PIN ASSIGNMENT
PT4112
WLED Driver for Notebook Display
16 pin 3×3 QFN
PAKAGE
(TOP VIEW)
16 15 14 13
GNDP 1
SW 2
IN 3
Vo 4
PT4112
12 FB4
11 BRT
10 GNDA
9 FB3
56 78
PIN DESCRIPTIONS
PIN NUM
1
2
3
4
5
6
7, 8, 9, 12,
13,14
10
11
15
16
PIN NAME
GNDP
SW
IN
Vo
ISET
VCC
FB1~FB6
GNDA
BRT
EN
Fault
DESCRIPTIONS
Power ground of the IC. It connects the source of the internal PWM switch
Switch Output. SW is the drain of the internal N-Ch MOSFET switch
Input Supply Pin. Must be locally bypassed.
Open Load Sensing Pin. Senses regulator output voltage to protect IC during open
load operation.
Connect a resistor on this pin to program LED current
IC Internal Supply Pin. It is the output of the internal LDO. Connect a 0.1uF bypass
capacitor to this pin.
LED String Current Control Input. Connect the bottom (Cathode) of the LED string
to it.
Signal Ground of the IC.
Dimming Control Logic Input. The dimming frequency range is 100Hz to 1KHz.
The Chip Enable Pin. Input logic high level turns on the IC.
Fault Protection Output Pin. This pin drive an external PFET or used as system
fault report signal.
ABSOLUTE MAXIMUM RATINGS (NOTE1)
SYMBOL
VIN
VFAULT
VCC
VSW
Vo
VFB1~6
VIO
TJ
TSTG
ITEM
Voltage on IN pin
Voltage on FAULT pin
Voltage on VCC pin
Voltage on SW pin
Voltage on Vo pin
Voltage on FB1-FB6 pin
Voltage on other pins
Operating junction temperature
Storage temperature
RATING
-0.3~25
-0.3~25
-0.3~5.5
-0.3~40
-0.3~40
-0.3~30
-0.3~5.5
-40~150
-65~150
UNIT
V
V
V
V
V
V
V
oC
oC
PT4112_DSB Rev EN_0.1
www.micro-bridge.com
Page 2


Part Number PT4112
Description WLED Driver
Maker PowTech
PDF Download

PT4112 Datasheet PDF






Similar Datasheet

1 PT4110 Side View and Thin Flat Type Phototransistors
Sharp Electrionic Components
2 PT4110 High Efficiency White LED Driver
Powtech
3 PT4110F Side View and Thin Flat Type Phototransistors
Sharp Electrionic Components
4 PT4112 WLED Driver
PowTech
5 PT4113 480mA LED backlight
PowTech
6 PT4115 1.2A high light ratio LED constant current driver
LIZE
7 PT4115 Built-in MOS tube 1.2A high power LED constant current driver
HOTCHIP
8 PT4115 1.2A Step-down High Brightness LED Driver
PowTech
9 PT4115B Continuous inductor current conduction mode drop Constant current source
LIZE





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy