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PDF SC445 Data sheet ( Hoja de datos )
| Número de pieza | SC445 | |
| Descripción | High Efficiency Integrated Driver | |
| Fabricantes | Semtech | |
| Logotipo |  |
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SC445
POWER MANAGEMENT
Features
High Efficiency Integrated Driver for
4-Strings of 150mA LEDs
Description
Wide input voltage range from 4.5V to 27V
Sustain fast Vin fluctuation up to 5v/µs
42V maximum output voltage
Drives up to 40 WLEDs in 4 strings
Programmable LED current for up to 150mA per
string
+/- 2% string-to-string current matching
Up to 90% efficiency
Wide 0.2% to 100% PWM dimming range
Enable analog dimming
Integrated 3.0A power switch
700KHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Short LED protection enable/disable
Thermal protection with auto-recovery
Thermally enhanced TSSOP-20 EDP package
Lead-free, Halogen-Free and WeEE/RoHS Compliant
Applications
Medium-sized LCD panel
Notebook Display
Automotive Car Navigation Display
Sub-Notebook and Tablet Computer Displays
Portable Media Players
The SC445 is a high-efficiency multiple string WLED driver
with an integrated boost converter. It operates over a
wide input range from 4.5V to 27V and can sustain fast
Vin transient up to 5V/µs. It can drive up to forty WLEDs in
4 strings with current up to 150mA per string. The string-
to-string current matching is 2% typical, 3% maximum.
The overall efficiency is greater than 90% due to the low
current sense voltage and a low-impedance internal pow-
er switch. The wide PWM dimming range boasts a ratio of
500: 1.
The 700KHz switching frequency enables the user to op-
timize the external component sizes for efficiency. When
there are fewer than 10 LEDs in each string, users can ad-
just the output voltage protection yielding an allowable
reduction in associated costs, size and voltage ratings of
the output capacitor.
The SC445 also features comprehensive open and short-
circuit LED protection functions. It disables the corre-
sponding strings with LED open or LED short conditions
while maintaining normal operation of other, unaffected
LEDhttp://www.DataSheet4U.net/ strings. This feature allows LCD panels to remain view-
able even under LED failure, wire disconnect, or short-cir-
cuit conditions. The internal thermal shutdown protects
the IC from overheating at abnormal conditions.
The SC445 is available in a thermally-enhanced TSSOP-20
EDP package.
Typical Application Circuit
Vin (4.5V -27V)
SW
VIN
SCP_EN
EN
SW
VOUT
OOVVPPIINN
FFLAG
PWM SC445
COMP
IOIO11- -44
IIOOSSEETT
AAGGNNDD
SS
EDP
PPGGNNDD
IOGND
PGND
4
1
2
4 Strings
12
Revision 2.1
datasheet pdf - http://www.DataSheet4U.net/
1 page | ||
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| PDF Descargar | [ Datasheet SC445.PDF ] | |
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