Prema's PR4404 is a low voltage boost driver for 0.5W/1W high power LEDs that can deliver up to 150mA LED current from a single cell (1.2V/1.5V) or up to two cells (2.4V/3.0V) 300mA LED current. Therefore, PR4404 can be widely used in LED torch, LCD screen backlight, home lighting and toys. This article introduces PR4404 main features, block diagram, typical application circuit, test circuit, flashlight application circuit, LED string drive circuit diagram and PWM control LED driver circuit diagram.
Low Voltage Boost Driver PR4404 for 0.5W / 1W Power LEDs
The PR4404 is a step-up converter for white LEDs, operating with single battery cell
Supply (1.2/1.5V) at up to 150mA LED current or dual cell supply (2.4/3.0V) at up to
300mA LED current.
A minimum part count allows compact and cost-efficient solutions.
The converter can be switched on and off with a logic signal, which is useful eg for PWM
Control, timer circuits etc.
Main features of PR4404:
Minimum startup voltage 1.0V
Supply by one or two battery cells
Low number of external components
Battery deep discharge protection
application:
LED torches
LCD panel backlighting
Home lighting
Toys
Figure 1. Block diagram of PR4404
Figure 2. PR4404 Typical Application Circuit
Figure 3. PR4404 test circuit
Figure 4. Flashlight application circuit
Components used for 150mA LED current:
Vcc: 1.2...1.5V (nominal)
C1a: 1μF
C1b: 100μF/6.3V
L1: 1.0μH, Isat ï‚³ï€ 1.2A
D1: MBRS140 or 1N5817
Rs: 1.3 ï—
C2a: 470nF
C2b: 22μF/6.3V
Components used for 300mA LED current:
Vcc: 2.4...3.0V (nominal)
C1a: 470nF
C1b: 100μF/6.3V
L1: 1.5μH, Isat ï‚³ï€ 1.6A
D1: MBRS140 or 1N5817
Rs: 0.67 ï—
C2a: 470nF
C2b: 22μF/6.3V
Figure 5. PR4404 drive LED string circuit diagram
Figure 6. PR4404 drive PWM control LED circuit diagram
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