OCP8178A Driver Datasheet

OCP8178A Datasheet, PDF, Equivalent


Part Number

OCP8178A

Description

White LED Driver

Manufacture

ORIENT-CHIP

Total Page 3 Pages
Datasheet
Download OCP8178A Datasheet


OCP8178A
OCP8178A
White LED Driver With Digital and PWM Brightness Control
General Description
With a 40-V rated integrated switch FET, the
OCP8178A is a boost converter that drives LEDs in
series. The boost converter runs at 600kHz fixed
switching frequency to reduce output ripple, improve
conversion efficiency, and allows for the use of small
external components.
The default white LED current is set with the
external sensor resistor Rset, and the feedback voltage
is regulated to 200mV, as shown in the typical
application. During the operation, A pulse width
modulation (PWM) signal can be applied to the CTRL
pin through which the duty cycle determines the
feedback reference voltage. In PWM mode, the
OCP8178A does not burst the LED current; therefore,
it does not generate audible noises on the output
capacitor. For maximum protection, the device features
integrated open LED protection that disables the
OCP8178A to prevent the output voltage from
exceeding the IC's absolute maximum voltage ratings
during open LED conditions.
The OCP8178A is available in a space-saving,
2mm × 2mm DFN package with thermal pad.
Features
2.7V to 5.5V Input Voltage Range
38V Open LED Protection
200mV Reference Voltage
Flexible Digital and PWM Brightness Control
Built-in Soft Start
Up to 90% Efficiency
2mm × 2mm × 0.8mm DNF2X2-6L(6-pin DFN )
Package With Thermal Pad
Applications
Cellular Phones
Portable Media Players
Ultra Mobile Devices
GPS Receivers
White LED Backlighting for Media Form Factor
Display
Page1 - 3
Rev. 1.1 Feb.27 2018
源于灿瑞 磁传天下

OCP8178A
Pin Configuration
DFN2X2-6L(TOP VIEW)
OCP8178A
Figure 1, Pin Assignments of OCP8178
Pin
Name
VIN
SW
GND
FB
COMP
CTRL
Thermal
Pad
Pin No. I/O
Pin Function
6
I
The input supply pin for the IC. Connect VIN to a supply voltage
between 2.7V and 5.5V.
This is the switching node of the IC. Connect the inductor between
4 O the VIN and SW pin. This pin is also used to sense the output voltage
for open LED protection
3 I Ground
1
I
Feedback pin for current. Connect the sense resistor from FB to
GND.
2
O
Output of the transconductance error amplifier. Connect an external
capacitor to this pin to compensate the converter.
5
I
Control pin of the boost converter. It is a multi-functional pin which
can be used for enable control, PWM dimming.
The thermal pad should be soldered to the analog ground plane. If
possible, use thermal via to connect to ground plane for ideal power
dissipation.
Typical Application Circuit
Figure 2, Typical Application Circuit of OCP8178A
Page2 - 3
Rev. 1.1 Feb.27 2018
源于灿瑞 磁传天下


Features WWW.ORIENT-CHIP.COM OCP8178A White LED Driver With Digital and PWM Brightness Control ◼ General Description With a 40-V rated integrated switch FET, the OCP8178A is a boost converter that dri ves LEDs in series. The boost converter runs at 600kHz fixed switching frequen cy to reduce output ripple, improve con version efficiency, and allows for the use of small external components. The d efault white LED current is set with th e external sensor resistor Rset, and th e feedback voltage is regulated to 200m V, as shown in the typical application. During the operation, A pulse width mo dulation (PWM) signal can be applied to the CTRL pin through which the duty cy cle determines the feedback reference v oltage. In PWM mode, the OCP8178A does not burst the LED current; therefore, i t does not generate audible noises on t he output capacitor. For maximum protec tion, the device features integrated op en LED protection that disables the OCP 8178A to prevent the output voltage from exceeding the IC's abs.
Keywords OCP8178A, datasheet, pdf, ORIENT-CHIP, White, LED, Driver, CP8178A, P8178A, 8178A, OCP8178, OCP817, OCP81, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)