DFN3030-10L (Top View)
frankeFigure 1, Pin Assignments of OCP8111
General Description
The OCP8111 is current-regulated charge pump ideal for powering high brightness LEDs for camera
flash applications. The charge pump can be t to regulate two current levels for FLASH and TORCH modes. The OCP8111 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. It
switches at 1.8MHz, allowing the u of tiny components. The supply voltage ranges from 2.7V to 5.
5V and is ideally suited for all applications powered by a single Li_Ion battery cell or three to four NiCd, NiMH, or Alkaline battery cells.
The OCP8111 also features a very low shutdown current (less than 1uA), an automatic soft-start mode to
limit inrush current, as well as over current, over voltage and over temperature shutdown control. A Low current n reference voltage (50mV) allows the ur of small 0603 current nsing resistors. The OCP8111 is offered in Green 10-pin DFN
package and is specified over an ambient temperature range of -40˚C to 85˚C. Features
z Output Current up to 1.0A at VIN=4.2V
z Up to 94% Efficiency in Torch Mode z Adjustable FLASH Mode Current
z Minimum External Components: No Inductors z Automatic Buck/Boost Mode Switchover z Wide V IN Range: 2.7V to 5.5V z High Frequency Operation: 1.8MHz
z 50mV Reference for low Loss Sensing z ISD < 1μA in Shutdown z PWM Dimming Control z Aut
omatic Soft Start Limits Inrush Current z Over Voltage Protection on Output z Over Current Protection z Over Temperature Protection z Low Input and Output Ripple and Low EMI z Ultra-low Dropout Voltage in Buck Mode z Space Saving RoHS Compliant, Lead Free Package: 10-pin 3mm x 3mm DFN Applications
z White LED Torch/Flash for Cell Phones, DSCs, and Camcorders z White LED Backlighting z Generic Lighting/Flash/Strobe Applications z General Purpo High Current Boost Pin Configuration
Typical Application Circuit
Figure 2, Typical Application Circuit of OCP8111
1.0A Buck/Boost Charge Pump LED Driver
Block Diagram
Figure 3, Block Diagram of OCP8111
Absolute Maximum Ratings1 (T A=25°C unless otherwi noted)
Parameter Symbol Rating Unit
Input Voltage V IN-0.3 to 6V
V EN ,I SET,V OUT Voltage
to
-0.3
towerbridgeV IN V Storage Temperature Range T S-55 to +150 ℃Operating Junction Temperature Range T J-40 to 150 ℃
Maximum Power Dissipation P D 1.9 W
Maximum Thermal Resistance θJA 51 /W
℃
简单机械和功ESD (HBM) ESD 4K V
Output Current Pul (Flash) I OUT 1.6 A Output Current Continuous (Torch) I OUT 0.4 A
Recommended Operating Conditions (T
=25°C unless otherwi noted)
A
bawParameter Symbol Conditions Rating Unit
Supply Voltage V IN Operating 2.7 ~ 5.5 V
+85 ℃Operating Temperature Range T A Operating -40
教学大纲怎么写~
Electrical Characteristics
(Unless otherwi noted，typical values are at T A=25, V
℃IN=3.6V, C FC=1uF, C OUT=10uF)
Symbol Parameter Conditions Min. Typ. Max. Unit Input Power Supply
V IN Input
Voltage
range 2.7 - 5.5 V
I SD Shutdown Current EN=0V,Shutdown mode - 0.1 1 μA
I Q Quiescent
Current V IN = 2.7 - 5.5V, FLASH = GND,
1X Mode, I LOAD=100μA
- 0.34 2 mA FLASH = HIGH, 2X Mode - 1.75 - mA
V FB FB Reference voltage FLASH = GND 45 50 55 mV FLASH = High, RSET = 53.6 kΩ138 150 162 mV
V FBR FB Reference Voltage Range FLASH = High. Guaranteed by
design.
100 - 400
mV
I FB FB Pin Current V FB= 0.3V - - 1 μA Charge Pump Section
R2X Charge Pump Equivalent
Resistance (x2 mode)
V FB = 0.0V, V IN= 3.6V - 4 - Ω
R1X Charge Pump Equivalent
Resistance (x1 mode)
forrest gumpV IN= 3.6V - 0.4 0.7 Ω
T SS V OUT Turn-on Time VIN= 3.6V, FB within 90% of
双城记英文读后感regulation
- 140 250
μs
inconsolable
F OSC Switching
Frequency - 1.8 - MHz
V OUT Over-voltage Limit LED unconnected, V IN上海西点培训学校
= 4.2V - 5.1 - V TSD Shutdown
Temperature Temperature
rising - 145 - ℃TRT Recovery
Temperature Temperature falling - 135 - ℃ENABLE
V ENL Enable
Threshold
Low - - 0.4 V
V ENH Enable
Threshold
High 1.4 - - V
I LK EN, FLASH Pin Current - - 1 μA
T FLASH Maximum Flash ON time FLASH = High 1.2 - 3.8 s
Typical Performance Characteristics:
℃V IN=3.6V, C IN=10uF, C FC=1uF, C OUT=10uF)
(Unless otherwi noted，T A=25,
Figure 4, Output Current vs. Supply Voltage Figure 5, VFB vs. RSET Resistance
Figure 6, Flash 700mA Output Current vs. VIN Figure 7, Torch Output Current vs. VIN
Figure 8, Torch in 1X to Flash in 1X, VIN=4.2V Figure 9, Torch in 1X to Flash in 2X, VIN=3.6V
Typical Performance Characteristics:
℃IN=3.6V, C IN=10uF, C FC=1uF, C OUT=10uF)
(Unless otherwi noted，T A=25, V财务会计报表
Figure 10, 250mA Torch, VIN=3.6V, VF=3.1V Figure 11, 250mA Torch, VIN=4.2V, VF=3.1V
Figure 12, 850mA Flash in 1X, VIN=4.2V, VF=3.1V Figure 13, 850mA Flash in 2X, VIN=3.6V, VF=3.1V
Figure 14, Start Up 850mA Flash, VIN=3.6V, VF=3.1V Figure 15, Start Up 850mA Flash, VIN=3.6V, VF=3.9V
