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OCP8135
1.5A High Efficiency Synchronous Boost Flash LED Driver
With 1-Wire Flash Dimming
General Description
The OCP8135 is a 2MHz fixed frequency
synchronous boost converter, optimized for maximum
1.5A camera flash application and maximum 800mA
movie mode applications using high-current white
LEDs in all single cell Li-ion powered products. An
adaptive regulation method ensures the current for
each LED remains in regulation and maximizes
efficiency.
Two simple logic control inputs (ENM and ENF)
enable and disable flash and movie mode operation of
the OCP8135. Movie-mode and Flash-mode current
levels are independently fixed by two separate
resistors (RM and RF).
For Flash mode, a default timer can be used either
to terminate a flash event or as a safety flash timer. In
flash mode, the flash LED current can be programmed
in 16 steps by the 1-wire dimming interface at ENF pin.
One or two LEDs can be connected to the OCP8135;
in the case of two LEDs the output current is matched
between each diode.
Thermal regulation is integrated in Flash mode to
limit the ICs temperature and continuously provide the
maximum allowed output current.
The OCP8135 contain a thermal management
system to protect the device; a internal over-voltage
protection (OVP) circuitry prevents damaged to the
OCP8135 from open LED or open circuit conditions;
and a cycle-by-cycle current limit prevents damage to
the OCP8135. Built-in circuitry prevents excessive
inrush current during start-up. The shutdown feature
reduces quiescent current to less than 1.0μA.
The 2MHz switching frequency allow for the use of
tiny, low profile (1uH or 2.2uH) inductors and 4.7uF
ceramic capacitors. The device is available in 14-pin
2mmX3mm DFN package and is rated over the -40°C
to 85°C.
Features
Input Voltage Range : 2.7V to 5.5V
Dual Channel Output
Drives up to 1.5A Regulated Output Current
(0.75A per Channel)
High Efficiency PWM Boost Converter
2.0MHz Fixed Switching Frequency
Up to 97% Efficiency with Small Inductor 1uH
Integrated Soft-Start Eliminates Inrush Current
Under Voltage Lock-Out
Thermal management and Current Scale Back
Optimize Flash Current During Low Battery
Over Voltage (Open LED) Protection
LED Short Circuit Protection
Movie Mode Dimming via Maximum 10KHz
PWM Control
800mS Flash Timer Control
Cycle by Cycle Current Limit
Separate Hardware Flash and Movie Enable
Flash Mode With 1-wire Dimming
Independently Set Flash/Movie Currents
Flash Mode Current Up to 1.5A
Movie Mode Current Up to 800mA
Two Resistors Set Flash and Movie Current
Independently
Small Solution Size
Less than 1uA Shutdown Current
RoHS and Green Compliant
14-pin, 2mm X 3mm DFN Packages
-40to +85 Temperature Range
Applications
Camera Flashes and Movies
Cell Phones or Smart Phones
PDAs and Digital Camera
White LED Biasing
Mobil Handsets
Tablet PCs and Laptops/Netbooks
Camcorder Video Light (Movie Light)
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Ver.1.2 Feb .27, 2018
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Pin Configuration
DFN2030-14L (Top View)
OCP8135
Figure 1, Pin Assignments of OCP8135
Pin
Name
RM
RF
AGND
VIN
SW
SW
PGND
OUT
ENF
ENM
LED1
AGND
LED2
GND
Pin No.
DFN2030-
14L
1
2
3
4
5
6
7
8, 9
10
11
12
13
14
EP
I/O Pin Function
Movie mode current setting input. A 68kΩ resistor from RM to GND sets the
I/O
desired movie current available at LED1 and LED2 up to 200mA total current.
Each LED1 and LED2 channel will conduct 50% of the maximum
programmed current.
Flash mode current setting input. A 9.1kΩ resistor from RF to GND sets the
I/O
maximum flash current available at LED1 and LED2 up to 1.5A total current.
Each LED1 and LED2 channel will conduct 50% of the maximum
programmed current.
P Analog Ground and flash ground.
P
Power input. Connect VIN to the input power supply voltage. Connect a 4.7uF
ceramic capacitor from VIN to GND as close as possible to OCP8135.
O Drain connection for internal NMOS and Synchronous PMOS Switches.
O Drain connection for internal NMOS and Synchronous PMOS Switches.
P
Boost power ground pin. Connect PGND to GND and FGND at a single point
as close as possible to OCP8135.
Power output of the boost converter. Connect a 4.7uF ceramic capacitor from
O OUT to PGND as close as possible to the OCP8135. Connect OUT to the
anodes of the Flash LEDs.
Flash mode 1-wire dimming interface pin. A low to high transition on the ENF
I pin initiates flash mode current level set by RF resistor. ENF is a active high
control input with a internal 300kΩ resistance to GND.
Movie mode enable pin. A low to high transition on the ENM pin initiates
I movie mode current level set by RM resistor. ENM is a active high control
input with a internal 300kΩ resistance to GND.
Channel 1 flash LED pin. For a single flash LED, connect LED1 and LED2
O together. For two flash LEDs, each output will conduct of 50% of the total
flash current. LED1 is high impedance during shutdown.
P Analog Ground and flash ground.
Channel 2 flash LED pin. For a single flash LED, connect LED1 and LED2
O together. For two flash LEDs, each output will conduct of 50% of the total
flash current. LED2 is high impedance during shutdown.
P Exposed paddle (bottom). Connect EP to PGND as close as possible.
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Ver.1.2 Feb .27, 2018
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Typical Application Circuit
OCP8135
Figure 2A, Typical Application Circuit of OCP8135
Figure 2B, Typical Application Circuit of OCP8135 (One Channel)
Figure 2C, Typical Application Circuit of OCP8135 (One Channel)
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Ver.1.2 Feb .27, 2018
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OCP8135
Ordering Information
OCP8135XXX
Part Number
OCP8135VAD
Package
V:DFN2030-14L
Packing
A:Tape&Reel
Temperature Grade
D: -40°C~85°C
Driver Capability
1.5A or 2*0.75A
Package Type
Package Qty
Temperature Eco Plan
DFN2030-14L 7-in reel 3000pcs/reel -4085Green
Lead
Cu
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Ver.1.2 Feb .27, 2018
源于灿瑞 磁传天下