Boost Regulator Input Voltage Range Peak Current Limited Control
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UCC1812 UCC2812 UCC3812
Boost Regulator
Input Voltage Range Peak Current Limited Control 250µA Operating Supply Current 25µA Shutdown Supply Current 12V/100mA Output Available SOIC Packages
ADVANCED INFORMATION DESCRIPTION
UCC3812 power boost regulator that takes input outputs regulated 100mA. part uses peak current sensing with fixed time current control. internal power with RDSON 200m allows peak input currents
BLOCK DIAGRAM
UDG-97088
TYPICAL APPLICATION CIRCUIT
UDG-97089
4/97
UCC1812 UCC2812 UCC3812
ABSOLUTE MAXIMUM RATINGS
Input Voltage 6.5V Power Dissapation 0.4W Storage Temperature -65°C +150°C Junction Temperature -55°C +150°C Lead Temperature (Soldering, sec.) +300°C Currents positive into, negative specified terminal. Consult Packaging Section Databook thermal limitations considerations packages.
CONNECTION DIAGRAM
DIP-8, SOIC-8 (Top View) Package, Package
THERMAL DATA
SOIC Thermal Resistance Junction Case 42°C/W Thermal Resistance Junction Ambient 160°C/W Note: above numbers maximums limiting thermal resistance package standard mounting configuration. numbers meant guidelines thermal performance device board system. above numbers assume ambient airflow. packaging section Databook more details.
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, 70°C UCC3812, -40°C 85°C UCC2812, -55°C 125°C 1812.
PARAMETER Overall Output Voltage Output Current Minimum Startup Voltage Minimum Operating Voltage Load Regulation Total Variation Supply Current Shutdown Current Voltage Error Amplifier VOUT High VOUT Open Loop Gain Input Bias Current Input Voltage Gain Bandwidth Product Total Variation Current Sense Section Peak Current Sensing Accuracy Peak Current Delay Gate Driver Pull Down Resistance Thermal Shutdown Shutdown Temperature Hysteresis 0.35 IPEAK 100kHz, 10mVp-p 11.4 12.6 ENBL VDD, 200kHz ENBL 11.4 12.6 11.64 12.36 TEST CONDITIONS UNITS
UCC1812 UCC2812 UCC3812
DESCRIPTION
CGND: power ground reference other part functions. COMP: Output voltage error amplifier. ENBL: logic level input used switch device current shutdown mode. Pulling ENBL puts part shutdown mode. PWRGND: Power ground high current DMOS output section. PWROUT: Drain internal DMOS device with source connected through sense resistor PWRGND. This device peak current limit VDD: power supply input connection device connected voltage VOUT: Voltage feedback from regulated non-inverting input voltage error amplifier. This input also used bootstrap gate drive power DMOS device. VSNS: inverting input voltage amplifier.
APPLICATION INFORMATION
UCC3812 boost controller with integrated MOSFET. control provided constant time current loop with outer voltage loop output voltage regulation. advantage constant time current loop that provides cycle cycle current limiting benefits current mode control such easy compensation voltage loop, while being inherently stable therefore requiring ramp compensation. UCC3812 takes input voltage range boosts regulated output. With MOSFET current sensing circuitry internal design converter very straight forward. maximum load current 100mA minimum input voltage average input current will 400mA. inductor current ripple chosen half IIN. Therefore, inductor required allowable ripple current. general capacitor suggested limit ripple voltage. this application approximately 200m will limit ripple voltage (neglecting capacitive discharge) 100mV. Several capacitors appropriate here, 33µF OsCON 220µF, electrolytic capacitor would acceptable. diode chosen handle load current. schottky rectifier good choice voltage drop. 1N5819, equivalent appropriate here. Compensation Compensation converter accomplished with simple dominate pole compensation. case where 33µF output capacitor used, 680pF capacitor feedback loop will give 600Hz cross over frequency with phase margin 50°C 220µF capacitor used 6.8nF feedback capacitor will result cross over frequency 60Hz phase margin about 60°C). higher bandwidth required faster transient response, zero-pole pair used compensation.
3µS. Therefore, inductance required 45µH. output capacitor chosen ripple voltage it's
UNITRODE CORPORATION CONTINENTAL BLVD. MERRIMACK, 03054 TEL. (603) 424-2410 (603) 424-3460
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