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OCP8171
CABC Compatible High Efficiency Boost LED
Backlight Driver
General Description
The OCP8171 is a step-up single channel LED
driver with high efficiency DC-DC step-up converter
architecture. With high up to 1.5A current limit allow
OCP8171 to deliver 200mA total current with 10
strings of 3 WLED in series. Alternatively, OCP8171
can drive up to 10 white LEDs in series (maximum
36V output) from a single cell Lithium Ion battery. It
can also maximize the current capability while
achieve high conversion efficiency.
The OCP8171 uses current mode, fixed
frequency of approximately 1.2MHz to reduce the
conduction loss and reduce output ripple, improve
conversion efficiency, and allows for use of small
external components. The feedback voltage is
regulated to 200mV, OCP8171 can also reduce
power loss and improves efficiency.
Wide range of PWM dimming through EN pin is
available. The frequency range of the filtered PWM
dimming extends up to 200KHz eliminating the
audible noise and suitable for CABC (Content
Adaptive Brightness Control) applications.
The OCP8171 ensures safe operation with
complete protection against all fault conditions.
Built-in protection circuitry is provided for supply
under-voltage, current limiting and over-temperature
conditions.
The OCP8171 has integrated a 36V over voltage
protection function through detect the output voltage.
When OCP8171 enters the OVP fault status, the
delay timer is active. If the OVP fault status exists
over the delay timer, OCP8171 would be latched to
shut-down status. Recovery it from restart the power
supply.
The OCP8171 is available in small 6-pin
TSOT23 and DFN2020-8L package, OCP8171 is
rated over the -40°C to 85°C.
Features
Input Voltage Range : 2.7V to 6V
Drives up to 10 Series White LEDs
High Efficiency PWM Boost Converter
1.2MHz Fixed Switching Frequency
Internal 40V High Current Switch (1.5A Limit)
Up to 87% Efficiency
Low 200mV Feedback Voltage
Integrated Soft-Start
EN PWM Dimming Range: 20KHz to 200KHz
Small Solution Size
LED Open-circuit (OVP) Protection: 36V
Under Voltage Lock-Out
Over-Temperature Protection
Less than 1uA Shutdown Current
RoHS and Green Compliant
Small TSOT23-6L and DFN2020-8L Packages
-40to +85 Temperature Range
Applications
LED Backlighting
Handheld Computers
5~10LCD Panels
Mobile Internet Devices
NetBook/EPCC
Digital Photo Frame/Cameras
Portable DVD
Car TV
GPS and DSC
Automotive Navigation
Pin Configuration
TSOT23-6L (Top View)
DFN2020-8L (Top View)
Figure 1, Pin Assignments of OCP8171
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Ver. 1.2 Feb .27, 2018
源于灿瑞 磁传天下

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OCP8171
Pin Pin No.
Name TSOT23-6L DFN2020-8L
Pin Function
SW 1
8
Power Switch Pin. SW is the drain of the internal MOSFET switch. Connect
the power inductor and output rectifier to SW.
VSS
PGND
2
5 Signal Ground Pin.
1 Power Ground Pin.
FB 3
6
Feedback Pin. The OCP8171 regulates the voltage across the current sense
resistor between FB and VSS. The regulation voltage is 200mV.
EN
OVP
4
5
Enable and Dimming Control Pin.
1. Enable: A voltage greater than 1.4V will turn the part on and less than
4 0.4V will turn the part off.
2. CABC compatible PWM Dimming Control: 20KHz to 200KHz PWM
signal on the pin controls LED average conduction current.
3 Connected to output, Over-voltage protection detect pin.
VDD
6
2 Input supply pin. Bypass this pin to ground locally.
Typical Application Circuit
Figure 2, Typical Application Circuit of OCP8171
Ordering Information
Part Number
OCP8171TWAD
OCP8171VAD
Package Type
TSOT23-6L
DFN2020-8L
Package Qty
7-in reel 3000pcs/reel
7-in reel 3000pcs/reel
Temperature
-4085
-4085
Eco Plan
Green
Green
Lead
Cu
Cu
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Page2 - 2
Ver. 1.2 Feb .27, 2018
源于灿瑞 磁传天下