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TS1916 データシート(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

部品番号 TS1916
部品情報  1.7A Boost WLED Driver
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メーカー  TSC [Taiwan Semiconductor Company, Ltd]
ホームページ  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS1916 データシート(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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TS1916
1.7A Boost WLED Driver
5/10
Version: A14
Application Information
Setting the ILED Current
Application circuit item shows the basic application circuit with TS1916 adjustable output version. The external
resistor sets the LED output current according to the following equation:
ILED = ( VFB / R3 )
Part No.
ILED
R3
TS1916
20mA
10Ω
4mW
350mA
0.571Ω
70mW
Over Voltage Protection
The Over Voltage Protection is detected by a junction breakdown detecting circuit. Once VOUT goes over the
detecting voltage, SW pin stops switching and the power N-MOSFET will be turned off. Then, the VOUT will be
clamped to be near VOVP.
Under Voltage Lockout (UVLO)
To avoid mis-operation of the device at low input voltages an under voltage lockout is included that disables the
device, if the input voltage falls below (2.25V-100mV).
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input
capacitor impedance at the switching frequency shall be less than input source impedance to prevent high
frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must
be used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and
small temperature coefficients. A 4.7µF ceramic capacitor for most applications is sufficient. For a lower output
power requirement application, this value can be decreased.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The
output capacitor must have low impedance at the switching frequency. Ceramic capacitors with X5R or X7R
dielectrics are recommended due to their low ESR and high ripple current. A 1µF ceramic capacitors works for most
of the applications. Higher capacitor values can be used to improve the load transient response.


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