XC9116B02AMR Torex Semiconductor Ltd, XC9116B02AMR Datasheet - Page 6

• Manufacturer Part Number: XC9116B02AMR
• Description: IC, BOOST CONVERTER 1MHZ LED DRIVER
• Manufacturer: Torex Semiconductor Ltd

Specifications of XC9116B02AMR

• Primary Input Voltage: 6V
• No. Of Outputs: 1
• Output Voltage: 17.5V
• Output Current: 300mA
• Voltage Regulator Case Style: SOT-23
• No. Of Pins: 5
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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■OPERATIONAL EXPLANATIONS (Continued)
■NOTES ON USE
<Current Limit>
<Lx Overvoltage Limit Circuit>
<Maximum Duty Cycle Limit>
<CE Pin Function>
<Lx (Pin 1): Switch Pin>
<FB (Pin 3): Voltage Feedback Pin>
<CE (Pin 4): Chip Enable Pin>
<V
XC9116
The current limit circuit of the XC9116 series monitors the current flowing through the N-channel MOS driver transistor
connected to the Lx pin, and features a combination of the constant-current type current limit mode and the duty cycle
limit of the next pulse.
XC9116B series' Lx overvoltage limit circuit monitors the Lx pin voltage. When the Lx pin voltage exceeds than 19V
(TYP.), the IC performs the function of latching the OFF state of the driver transistor, and goes into operation suspension
mode. In suspension mode, operations can be resumed by restoring power to the V
does not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry
remains in operation.
The XC9116B series' maximum duty cycle limit circuit monitors the duty cycle. When the maximum duty cycle is
repeated for a certain time, the IC controls the error amplifier output so that the duty cycle of the next pulse becomes
smaller than that of the first pulse.
The operation of the XC9116 series will enter into the shut down mode when a low level signal is input to the CE pin.
During the shut down mode, the supply current is 0μA (TYP.), with high impedance at the Lx pin. The IC starts its
operation with a high level signal to the CE pin. The input to the CE/MODE pin is a CMOS input and the sink current is
0μA (TYP.). 100μs after disable, the IC goes into suspension mode and supply current is minimal. After this, the IC
will be in stand-by mode and the supply current will be 0μA (TYP.).
Please connect the anode of a Schottky barrier diode and an inductor to the Lx pin.
The reference voltage is 200mV (TYP.). A resistor (R
LEDs and a constant current value. The resistance value can be calculated by the following equation.
R
I
An ENABLED state is reached when the CE voltage exceeds 0.65V and a DISABLED state when the CE Voltage falls
below 0.2V.
Please connect an inductor and an input by-pass capacitor (C
LED
IN
Typical example:
LED
1When the driver current is greater than a specific level, the constant-current type current limit function operates to
2The IC controls the next pulse to be smaller than the first pulse.
L
I
(Pin 5): Power Supply Pin>
L
X
=Setting
turn off the pulses from the Lx pin at any given timing.
=0.2 / I
LED
10mA
5mA
constant current value
I
LED
Series
The current w ill be of f w hen the coil current
reaches the value of the constant current limit.
①
Current Limit
R
40 Ω
20 Ω
LED
LED
) should be connected to the FB pin for setting the cathode of
IN
) to the V
13.3mA
20mA
I
LED
IN
pin.
Limit some duty pulses af ter the
limit.
Current Limit
②
IN
pin. The suspension mode
R
15 Ω
10 Ω
LED