High-Power White LED Driver
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YB1509 High-Power White LED Driver
Features
2V to 16V Input Voltage 40V Maximum Output Voltage ...
Description
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YB1509 High-Power White LED Driver
Features
2V to 16V Input Voltage 40V Maximum Output Voltage Drive up to 18 White LEDs Adjustable Inductor Current 1µs Constant Off-time PFM Control 1KHz to 100KHz PWM Dimming Control
Description
The YB1509 is a high-power boost converter. An adjustable current limit, wide range of input voltage, and up to 40V of switch voltage are designed to drive white LEDs back-lighting for large LCD panel. It can drive up to 10 LEDs in series or 18 LEDs in parallel/series configuration. The wide application VIN range makes YB1509 suitable for many types of battery applications such as Li-ions, Alkaline, or Sealed Lead Acid batteries. The adjustable inductor current optimizes the performance for different output drive capability by an external resistor. The LED current is set by a resistor connected to FB pin. The On/Of duty with clock frequency from 1K to 100KHz at EN pin can control the LED brightness
Applications
PDA, Palmtops and Smart Phones LCD Monitor LCD TV Portable DVD player White LED backlighting GPS navigation system Handheld Game
Typical Application Circuit
VIN= 6 to14V
10uF 16V 22uH SL12 VIN 4.7uF 35V EN Bypass Iset LX
YB1509
FB
BZV55-B 36
2KOHM
10nF 6.3V
GND
1K
RFB 60OHM
Figure 1. Typical application circuit
YB1509 MRev.1.1
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1
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YB1509 High-Power White LED Driver
Pin Configuration
G ND
1
8
LX
VIN
2
7
Iset
YB 1509
B ypass 3 6 NC
FB
4
...
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