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YB1315 Schematic ( PDF Datasheet ) - YOBON TECHNOLOGIES

Teilenummer YB1315
Beschreibung High Efficiency Charge Pump White LED Driver
Hersteller YOBON TECHNOLOGIES
Logo YOBON TECHNOLOGIES Logo 



Gesamt 10 Seiten
YB1315 Datasheet, Funktion
Preliminary YB1315
High Efficiency Charge Pump White LED Driver
Description
The YB1315 charge pump is designed to
drive up to 5 white LEDs with regulated
constant current in backlight display
application. The device can provide up to
25mA per LED for a total 5 channels. The
output current can also be combined into
one single channel with 125mA output
current for flash-light applications. The
input voltage ranges from 2.7V to 5.5V and
is ideal for applications powered by a
single Li-Ion or 3 to 4 NiCd, NiMH or
Alkaline batteries.
YB1315 monitors the power-supply input
voltage and LED forward voltage and
current, and does an automatic selection to
a switching mode that is optimized for the
power conversion efficiency as well as
battery operating time. The 1MHz fixed
frequency switching allows for tiny external
components, and the regulation scheme is
optimized to ensure low EMI and low input
ripple.
Internal soft-start circuitry effectively
reduces the in-rush current. YB1315 also
provides short circuit protection,
over-temperature
protection
and
over-voltage protection. In shutdown mode,
the shutdown current is less than 1μA.
YB1315 is available in a TQFN-16 3x3
package.
Features
„ Voltage Input Range From 2.7V to 5.5V
„ Drives From 3 to 5 LEDs at Up to 25mA
Each
„ Fractional Conversion Modes for High
Conversion Efficiency, 1x and 1.5x
„ 1MHz Internal Oscillator
„ Thermal Protection Shutdown
„ Output Short-circuit Current Limit and
Over-Voltage Protection
„ Under-Voltage Lockout with Hysteresis
„ Automatic Soft-Start Reduces In-Rush
Current
„ 3mm x 3mm TQFN Package
Applications
„ White LED Backlighting
„ Handheld PCs and PDAs
„ Mobile Phone
„ DSC and DV flash light application
Typical Application Circuit
VIN = 2.7V
to 5.5V
1µF
0. 47µF
0. 47µF
VIN VOUT
C1+ D1
C1- D2
C2+ D3
YB1315
C2- D4
EN1 D5
EN2
GND
ISET
PGND
1uF
YB1315 Rev.0.1
Figure 1: Typical Application Circuit
www.yobon.com.tw
1






YB1315 Datasheet, Funktion
Preliminary YB1315
High Efficiency Charge Pump White LED Driver
Function Block
PGND VOUT
78
C1+ 10
C1- 11
C2+ 9
C2- 12
VIN 13
1x/1.5x
Charge Pump
Current Sinks
2 D5
3 D4
4 D3
5 D2
6 D1
Reference
EN1 15
EN2 16
UVLO
Control
14
GND
OVP
1 ISET
Figure 3: Function Block
Functional Description
The YB1315 uses a multi-mode fractional
charge pump to generate a supply voltage
and a precise sink circuitry to ensure a
constant driving current for each LED. The
charge pump operates in either 1x mode,
or 1.5x mode, depending on the input
voltage and output current loading. The
overall power consumption is best
optimized by automatically switching
among the 2 different operation mode.
The charge pump is possible to generate a
total output current of 125mA or more,
25mA for each LED. But it is recommended
to operate the device under total 120mA.
YB1315 Rev.0.1
www.yobon.com.tw
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