application INFO available UCC1807-1/-2/-3 UCC2807-1/-2/-3 UCC3807-1/-2/-3 Programmable Maximum Duty Cycle PWM Controller FEATURES User Programmable Maximum PWM Duty Cycle 100m A Startup Current Operation to 1MHz Internal Full Cycle Soft Start Internal Leading Edge Blanking of Current Sense Signal 1A Totem Pole Output DESCRIPTION The UCC3807 family of high speed, low power integrated circuits contains all of the control and drive circuitry required for off-line and DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. These devices are similar to the UCC3800 family, but with the added feature of a user programmable maximum duty cycle. Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor. The UCC3807 family also features internal full cycle soft start and internal leading edge blanking of the current sense input. The UCC3807 family offers a variety of package options, temperature range options, and choice of critical voltage levels. The family has UVLO thresholds and hysteresis levels for off-line and battery powered systems. Thresholds are shown in the table below. Part Number UCCx807-1 UCCx807-2 UCCx807-3 Turn-on Threshold 7.2V 12.5V 4.3V Turn-off Threshold 6.9V 8.3V 4.1V Packages J N, D N, D, PW BLOCK DIAGRAM UDG-95001-1 SLUS163 - JUNE 1997 1 UCC1807-1/-2/-3 UCC2807-1/-2/-3 UCC3807-1/-2/-3 CONNECTION DIAGRAMS ABSOLUTE MAXIMUM RATINGS Supply Voltage (IDD 10mA). . . . . . . . . . . . . . . . . . . . . . . 13.5V Supply Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA OUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1A Analog Inputs (FB, CS) . . . . . . . . . . . . . –0.3V to (VDD + 0.3V) Power Dissipation at TA +25°C (N or J packages) . . . . . . . . 1W Power Dissipation at TA +25°C (D package) . . . . . . . . . . 0.65W Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C DIL-8, SOIC-8, TSSOP-8 (Top View) J, N, D or PW Packages All currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. ORDERING INFORMATION UCC 807 – UVLO Threshold Package Temperature Range ELECTRICAL CHARACTERISTICS:Unless otherwise stated these specifications apply for TA = –55°C to +125°C for UCC1807-1/-2/-3; –40°C to +85°C for UCC2807-1/-2/-3; and 0°C to +70°C for UCC3807-1/-2/-3; VDD = 10V (Note 6), RA = 12kW , RB = 4.7kW , CT = 330pF, 1.0m F capacitor from VDD to GND, TA = TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS 175 202 228 kHz Oscillator Section Section Frequency Temperature Stability (Note 5) 2.5 % Amplitude (Note 1) 1/3VDD V Error Amplifier Section Input Voltage COMP = 2.0V 1.95 Input Bias Current –1 Open Loop Voltage Gain 60 2.00 2.05 V 1 m A 80 dB COMP Sink Current FB = 2.2V, COMP = 1.0V 0.3 2.5 mA COMP Source Current FB = 1.3V, COMP = 4.0V –0.2 –0.5 mA 75 78 PWM Section Maximum Duty Cycle Minimum Duty Cycle COMP = 0V 81 % 0 % 1.8 V/V Current Sense Section Gain (Note 2) Maximum Input Signal COMP = 5.0V (Note 3) Input Bias Current 1.65 0.9 1.0 –200 CS Blank Time Overcurrent Threshold COMP to CS Offset 1.1 CS = 0V 1.1 V 200 nA 150 ns 50 100 1.4 1.5 1.6 V 0.55 1.1 1.65 V 1 V Output Section OUT Low Level I = 100mA 0.4 OUT High Level I = –100mA, VDD - OUT 0.4 1 V Rise/Fall Time CL = 1nF (Note 5) 20 100 ns Undervoltage Lockout Section 2 UCC1807-1/-2/-3 UCC2807-1/-2/-3 UCC3807-1/-2/-3 ELECTRICAL CHARACTERISTICS:Unless otherwise stated these specifications apply for TA = –55°C to +125°C for UCC1807-1/-2/-3; –40°C to +85°C for UCC2807-1/-2/-3; and 0°C to +70°C for UCC3807-1/-2/-3; VDD = 10V (Note 6), RA = 12kW , RB = 4.7kW , CT = 330pF, 1.0m F capacitor from VDD to GND, TA = TJ. PARAMETER Start Threshold Minimum Operating Voltage After Start Hysteresis MIN TYP MAX UNITS UCCx807-1 (Note 4) TEST CONDITIONS 6.6 7.2 7.8 V UCCx807-2 11.5 12.5 13.5 V UCCx807-3 4.1 4.3 4.5 V UCCx807-1 (Note 4) 6.3 6.9 7.5 V UCCx807-2 7.6 8.3 9.0 V UCCx807-3 3.9 4.1 4.3 V UCCx807-1 0.1 0.3 0.5 V UCCx807-2 3.5 4.2 5.1 V UCCx807-3 0.1 0.2 0.3 V Soft Start Section COMP Rise Time FB = 1.8V, From 0.5V to 4.0V 4 ms Overall Section Startup Current VDD < Start Threshold (UCCx807-1,-3) 0.1 0.2 mA VDD < Start Threshold (UCCx807-2) 0.15 0.25 mA Operating Supply Current FB = 0V, CS = 0V, No Load (Note 7) 1.3 2.1 mA VDD Zener Shunt Voltage IDD = 10mA 12.0 13.5 15.0 0.5 1.0 Shunt to Start Difference V V Note 1: Measured at TRIG; signal minimum = 1/3 VDD, maximum = 2/3 VDD. VCOMP Note 2: Gain is defined by: A , 0 VCS 0.8V VCS Note 3: Parameter measured at trip point of latch with FB at 0V. Note 4: Start Threshold and Zener Shunt thresholds track one another. Note 5: Ensured by design. Not 100% tested in production. Note 6: Adjust VDD above the start threshold before setting at 10V for UCC3807-2. Note 7: Does not include current in external timing RC network. PIN DESCRIPTIONS COMP: COMP is the output of the error amplifier and the input of the PWM comparator. The error amplifier in the UCC3807 is a low output impedance, 2MHz operational amplifier. COMP can both source and sink current. The error amplifier is internally current limited, which allows zero duty cycle by externally forcing COMP to GND. affected by the leading edge blanking and the CS to OUT propagation delay. The overcurrent comparator is only intended for fault sensing. Exceeding the overcurrent threshold causes a soft start cycle. FB: The inverting input to the error amplifier. For best stability, keep connections to FB as short as possible and stray capacitance as small as possible. The UCC3807 family features built-in full cycle soft start. Soft start is implemented as a clamp on the maximum COMP voltage. GND: Reference ground and power ground for all functions of the part. CS: Current sense input. There are two current sense comparators on the chip, the PWM comparator and an overcurrent comparator. OUT: The output of a high current power driver capable of driving the gate of a power MOSFET with peak currents exceeding 1A. OUT is actively held low when VDD is below the UVLO threshold. The UCC3807 also contains a leading edge blanking circuit, which disconnects the external CS signal from the current sense comparator during the 100ns interval immediately following the rising edge of the signal at the OUT pin. In most applications, no analog filtering is required on CS. Compared to an external RC filtering technique, leading edge blanking provides a smaller effective CS to OUT propagation delay. Note, however, that the minimum non-zero on-time of the OUT signal is directly The high current power driver consists of MOSFET output devices in a totem pole configuration. This allows the output to switch from VDD to GND. The output stage also provides a very low impedance which minimizes overshoot and undershoot. In most cases, external Schottky clamp diodes are not required. 3 UCC1807-1/-2/-3 UCC2807-1/-2/-3 UCC3807-1/-2/-3 PIN DESCRIPTIONS (cont.) TRIG/DISCH: Oscillator control pins. Trig is the oscillator timing input, which has an RC-type charge/discharge signal controlling the chip’s internal oscillator. DISCH is the pin which provides the low impedance discharge path for the external RC network during normal operation. Oscillator frequency and maximum duty cycle are computed as follows: fre que ncy duty cycle For best performance, keep the lead from CT to GND as short as possible. A separate ground connection for CT is desirable. The minimum value of RA is 10kW , the minimum value of RB is 2.2kW , and the minimum value of CT is 47pF. VDD: The power input connection for this device. Total VDD current is the sum of quiescent current and the average OUT current. Knowing the operating frequency and the MOSFET gate charge (Qg), average OUT current can be calculated from 1.4 RA 2 R B CT RA RB R A 2R B IOUT = Qg F, where F is frequency. To prevent noise problems, bypass VDD to GND with a ceramic capacitor as close to the chip as possible in parallel with an electrolytic capacitor. as shown in Figure 1. UDG-95002-1 Figure 1. Oscillator Block Diagram APPLICATIONS INFORMATION The circuit shown in Fig. 2 illustrates the use of the UCC3807 in a typical off-line application. The 100W, 200kHz, universal input forward converter produces a regulated 12VDC at 8 Amps. The programmable maximum duty cycle of the UCC3807 allows operation down to 80VRMS and up to 265VRMS with a simple RCD clamp to limit the MOSFET voltage and provide core reset. In this application the maximum duty cycle is set to about 65%. Another feature of the design is the use of a flyback winding on the output filter choke for both bootstrapping and voltage regulation. This method of loop closure eliminates the optocoupler and secondary side regulator, common to most off-line designs, while providing good line and load regulation. T1: Core Primary: Secondary: L1: Core: Magnetics Inc. #P-42625-UG (ungapped) 28 turns of 2x #26AWG 6 turns of 50x0.2mm Litz wire Magnetics Inc. #P-42625-SG-37 (0.020” gap) 13 turns of 2x #18AWG 11 turns of #26AWG Main Winding: Second Winding: Magnetics Inc. 900 E. Butler Road P.O. Box 391 Butler, PA 16003 Tel: (412) 282-8282 Fax: (412) 282-6955 4 UCC1807-1/-2/-3 UCC2807-1/-2/-3 UCC3807-1/-2/-3 APPLICATIONS INFORMATION (cont.) UDG-96174 Figure 2. Typical Off-line Application Using UCC3807-2 5 PACKAGE OPTION ADDENDUM www.ti.com 4-Nov-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty UCC2807D-1 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807D-2 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807D-3 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807DTR-1 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807DTR-1G4 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807DTR-2 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807DTR-2G4 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807DTR-3 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807DTR-3G4 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807N-1 ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-NC-NC-NC UCC2807N-2 ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-NC-NC-NC UCC2807PW-3 ACTIVE TSSOP PW 14 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC2807PWTR-3 ACTIVE TSSOP PW 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807D-1 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807D-2 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807D-2G4 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807D-3 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807DTR-1 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807DTR-2 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807DTR-2G4 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807DTR-3 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807DTR-3G4 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR UCC3807N-1 ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-NC-NC-NC UCC3807N-2 ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-NC-NC-NC UCC3807N-3 ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-NC-NC-NC Addendum-Page 1 Lead/Ball Finish MSL Peak Temp (3) PACKAGE OPTION ADDENDUM www.ti.com 4-Nov-2005 Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty UCC3807N-3G4 ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) CU NIPDAU UCC3807PWTR-3 PREVIEW TSSOP PW 14 2000 TBD Call TI Lead/Ball Finish MSL Peak Temp (3) Level-NC-NC-NC Call TI (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2 MECHANICAL DATA MPDI001A – JANUARY 1995 – REVISED JUNE 1999 P (R-PDIP-T8) PLASTIC DUAL-IN-LINE 0.400 (10,60) 0.355 (9,02) 8 5 0.260 (6,60) 0.240 (6,10) 1 4 0.070 (1,78) MAX 0.325 (8,26) 0.300 (7,62) 0.020 (0,51) MIN 0.015 (0,38) Gage Plane 0.200 (5,08) MAX Seating Plane 0.010 (0,25) NOM 0.125 (3,18) MIN 0.100 (2,54) 0.021 (0,53) 0.015 (0,38) 0.430 (10,92) MAX 0.010 (0,25) M 4040082/D 05/98 NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Falls within JEDEC MS-001 For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MECHANICAL DATA MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999 PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0,30 0,19 0,65 14 0,10 M 8 0,15 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 1 7 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 8 14 16 20 24 28 A MAX 3,10 5,10 5,10 6,60 7,90 9,80 A MIN 2,90 4,90 4,90 6,40 7,70 9,60 DIM 4040064/F 01/97 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0,15. 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