EUP2537 Datasheet, PDF (1/1 Pages) Eutech Microelectronics Inc – 10 White LED Boost Converter

EUP2537
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10 White LED Boost Converter
with PWM Dimming
DESCRIPTION
The EUP2537 is a constant current step-up converter
specifically designed to drive white LEDs. With a 45V
rated integrated switch FET, the step-up converter
supports up to 10 white LEDs in series connection, so
the LED currents are identical for uniform brightness.
The boost converter runs at 1.0MHz fixed switching
frequency with 1.3A switch current limit, and allows
for the use of a high brightness LED in general lighting.
The maximum white LED current is set with the
external sensor resistor R_FB, and the feedback voltage is
regulated to 200mV, as shown in the typical application.
During the operation, the LED current can be
controlled through the EN pin with a 8KHz or higher
frequency PWM dimming signal on EN pin, EUP2537
operates in PWM dimming mode, which the duty cycle
determines the feedback reference voltage. The
EUP2537 does not generate audible noises on the
output capacitor. For the protection, the EUP2537
provides 41.5V OVP to prevent damage from LED
open.
The EUP2537 is available in low profile TSOT23-6
package.
FEATURES
2.6V to 5.5V Input Range
41.5V Output Over Voltage Protection
Internal Soft-Start
Internal Compensation
External PWM Dimming with 8KHz - 100KHz
Frequency Range
Internal 45V N-FET
1MHz Fixed Switching Frequency
Over Voltage Protection
Over Thermal Protection
V_IN Under Voltage LockOut
Available in TSOT23-6 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
Mobile Phones
GPS Navigation Systems
Portable Media Players
Handheld Devices, Digital Camera
Portable Game Machines
Typical Application Circuit
DS2537 Ver1.1 Jan. 2013
Figure 1. White LED Application
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