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PDF XC9116 Data sheet ( Hoja de datos )
| Número de pieza | XC9116 | |
| Descripción | Step-Up DC/DC Converter-Backlight LED Driver | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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XC9116 Series
Step-Up DC/DC Converter-Backlight LED Driver
ETR0407-002
■GENERAL DESCRIPTION
The XC9116 series is a fixed frequency, constant current step-up DC/DC converter ideal for driving LEDs used in backlighting
applications on cellular phones, PDAs and digital cameras etc. Output voltage of up to 17.5V can be derived, therefore, four
white LED’s in series can be driven. Since an LED current can be set up by an external resistance when LEDs are in-series
connection, all white LEDs can be turned on equably. A network of two parallel legs with three in each LED can be also
driven. Luminance of the LED's is controlled by changing the duty cycle of a PWM signal applied to the CE pin. Efficiency is
high with the XC9116 through the high 1.0MHz switching frequency and the low feedback reference voltage, ensuring the RLED
losses are minimal. In addition, an internal MOSFET with an RDSON of 2.0 Ω is used. A low profile and small board area
solution can be achieved using a chip coil and an ultra small ceramic output capacitor (CL) of 0.22µF.
The 'B' type of XC9116 has an additional fault detection circuit. If the LEDs are disconnected or damaged in such a way that
prevents feedback, excess or run away output voltage is prevented by stopping the drive to the internal MOSFET.
■APPLICATIONS
●For White LED drivers
○Mobile phones, PHS
○PDAs
○Digital still cameras
■FEATURES
Input Voltage Range
: 2.5V ~ 6.0V
Output Voltage Range : Up to 17.5V externally set-up
: Reference voltage 0.2V +5%
Oscillation Frequency : 1.0MHz, ±20%
ON Resistance
Efficiency
: 2.0Ω
: 86% (XC9116B Type)
: 84% (XC9116D Type)
(VIN=3.6V, ILED=20mA when
driving 3 white LEDs in series)
Control
: PWM control
Standby current
: ISTB=1.0µA (MAX.)
Load Capacitor
Lx Limit Current
: 0.22µF, ceramic
: 325mA
Lx Overvoltage Limit : XC9116B series
No Lx Overvoltage Limit : XC9116D series
■TYPICAL APPLICATION CIRCUIT
VIN
2.5V~6.0V
SD
XB0ASB03A1B
L:22uH
VLF3010A
■TYPICAL PERFORMANCE
CHARACTERISTICS
●XC9116B Type
CIN VIN Lx
1uF
100Hz to
10kHz
CE FB
VSS
RLED
10ohm
20mA
CL
0.22uF
1/22
1 page  
■TYPICAL APPLICATION CIRCUITS
●XC9116B02A
●XC9116D02A
XC9116
Series
■EXTERNAL COMPONENTS
SYMBOL
L
SBD (*1)
CIN
CL (*3)
ZD (*4)
R1
VALUE
22µH
-
4.7µF
0.22µF
18V
100 Ω
PART NUMBER
VLF3010A-220MR
XB0ASB03A1BR (*2)
MA2Z720
JMK107BJ475MA-B
TMK107BJ224KA-B
MAZ8180
-
MANUFACTURER
TDK
TOREX
PANASONIC
TAIYO YUDEN
TAIYO YUDEN
PANASONIC
-
NOTE :
*1: Please use a Schottky barrier diode (SBD) with a low junction capacitance, Cj.
*2: For using the XB0ASB03A1BR with four white LEDs in series, please be noted with a direct reverse voltage (VR=20V) and a
repetitive peak reverse voltage (VRM=30V).
*3: Use ceramic capacitors processing a low temperature coefficient.
*4: Please refer to the LED Open-circuit Protection at Application Information for setting the Zener diode.
■OPERATIONAL EXPLANATION
The series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase
compensation circuit, Lx overvoltage limit circuit, N-channel MOS driver transistor, current limiter circuit and others. The
series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback
voltage from the FB pin. Phase compensation is performed on the resulting error amplifier output, to input a signal to the
PWM comparator to determine the turn-on time during switching. The PWM comparator compares, in terms of voltage
level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output
to the N-channel MOS driver transistor to cause the Lx pin to output a switching duty cycle. This process is continuously
performed to ensure stable output voltage. The current feedback circuit detects the N-channel MOS driver transistor's
current for each switching operation, and modulates the error amplifier output signal. This enables a stable feedback
loop even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage.
<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the IC.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The 1MHz (TYP.) of frequency is fixed internally.
Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation.
<Error Amplifier>
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the FB pin
voltage. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier
increases. Gain and frequency characteristics of the error amplifier output are fixed internally as an optimize signal.
5/22
5 Page 
XC9116
Series
■APPLICATION INFORMATION (Continued)
<Instruction on Pattern Layout>
1. In order to stabilize VIN's voltage level, we recommend that an input by-pass capacitor (CIN) be connected as close as
possible to the VIN & VSS pins.
2. Please mount each external component as close to the IC as possible.
3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit
impedance.
4. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high ground
currents at the time of switching may result in instability of the IC.
●XC9116B Series Pattern Layout (SOT-25)
CE
GND
RLED
LED
CL V OUT
V IN
SBD
L
●XC9116D Series Pattern Layout (SOT-25)
RLED
CE
GND
R1
LED
ZD
CL V OUT
V IN
SBD
L
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet XC9116.PDF ] | |
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