MP1521EQ MPS [Monolithic Power Systems], MP1521EQ Datasheet - Page 3

• Manufacturer Part Number: MP1521EQ
• Description: MP1521 High Efficiency White LED Driver
• Manufacturer: MPS [Monolithic Power Systems]

Table 1: EV0021 Bill of Materials
Operating Instructions
1. Connect VCC to the power source’s positive output.
2. Connect GND to supply ground.
3. Applying a logic signal to EN pin will enable the MP1521. Logic high (V
4. Applying a PWM signal to the BRT will adjust the LED brightness. When used in analog
5. The FB1, FB2 and FB3 pins can be used to measure the voltage across the current-sense
6. OLS senses the regulator output voltage to protect IC during open load operation. When this
EV0021 Rev 1.1_01/21/03
Monolithic Power Systems
LEDS (Not Provided)
Parts
ICs
MP1521EQ
Capacitors
4.7µF
1µF, 25V
Resistors
10KΩ
20Ω
Inductors
15µH
Diodes
B130, 1A, 30V, Schottky
logic low puts it into low current shutdown mode. Place a 100KΩ resistor in series with EN if
the input is greater than 10V. For automatic start up connect EN to VCC.
mode, apply a DC voltage of 0.3 to 1.2V. This input voltage is attenuated by 1/3 to set the
voltage across sense resistors at FB1, FB2, and FB3. Maximum brightness (20mA) occurs
with 1.2V applied. To control brightness in PWM mode, apply a PWM square wave with a
minimum voltage less the 0.18V and a maximum greater than 1.2V. When a voltage less than
0.18V is applied to this pin, the output switch is turned off.
maximum brightness when more than 1.2V is applied. The frequency of the PWM signal must
be between 100 to 400 Hz.
resistor that is in series with the LED strings. Unused feedback pins must be connected to
any used feedback pin.
pin’s voltage exceeds 28V, the output switch is shut off. The output switch remains off until
the IC is reset by cycling the enable pin (EN) or input supply (VIN)
CDRH3D16
Package
QFN16
SMA
1206
1210
0603
0603
www.monolithicpower.com
Vendor
Sumida
MPS
Any
Any
Any
Any
Any
MP1521 High Efficiency
QTY
1
1
1
3
3
1
1
The regulator operates at
White LED Driver
Components
U1
C1
C2
R1, R2, R3
R4, R5, R6
L1
D1
EVALUATION BOARD
EN
>1V) turns on IC,
EV0021
3