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Part: UCC28503DW
Category:
Power Management
-> PWM Power Supply
-> Power Factor Correction IC's
Description: ti UCC28503, Bicmos Pfc/pwm Combination Controller
Company: Texas Instruments, Inc.
Datasheet: Download UCC28503DW datasheet File size : 266 kB
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Datasheet text preview:
UCC28500, UCC28501, UCC28502, UCC28503 UCC38500, UCC38501, UCC38502, UCC38503
SLUS419C AUGUST 1999 REVISED NOVEMBER 2001
BiCMOS PFC/PWM COMBINATION CONTROLLER
FEATURES D Combines PFC and Downstream Converter D D D D D D D D D
Controls Controls Boost Preregulator to Near-Unity Power Factor Accurate Power Limiting Improved Feedforward Line Regulation Peak Current-Mode Control in Second Stage Programmable Oscillator Leading-Edge/Trailing-Edge Modulation for Reduced Output Ripple Low Start-up Supply Current Synchronized Second Stage Start-Up, with Programmable Soft-start Programmable Second Stage Shutdown used to keep input power constant with varying input voltage. Generation of VFF is accomplished using IAC in conjunction with an external single-pole filter. This not only reduces external parts count, but also avoids the use of high-voltage components, offering a lower-cost solution. The multiplier then divides the line current by the square of VFF. The UCC2850x PFC section incorporates a low offset-voltage amplifier with 7.5-V reference, a highly-linear multiplier capable of a wide current range, a high-bandwidth, low offset-current amplifier, with a novel noise-attenuation configuration, PWM comparator and latch, and a high-current output driver. Additional PFC features include over-voltage protection, zero-power detection to turn off the output when VAOUT is below 0.33 V and peak current and power limiting. The dc-to-dc section relies on an error signal generated on the secondary-side and processes it by performing peak current mode control. The dc-to-dc section also features current limiting, a controlled soft-start, preset operating range with selectable options, and 50% maximum duty cycle. The UCC28500 and UCC28502 have a wide PFC-UVLO threshold (16.5 V/10 V) for bootstrap bias supply operation. The UCC28501 and UCC28503 are designed with a narrow UVLO range (10.5 V/10 V) more suitable for fixed bias operation. The UCC28500 and UCC28501 have a narrow UVLO threshold for PWM stage (to allow operation down to 75% of nominal bulk voltage), while the UCC28502 and UCC38503 are configured for a much wider operation range for the PWM stage (down to 50% of bulk nominal voltage). Available in 20-pin N and DW packages.
DESCRIPTION
The UCC2850x family provides all of the control functions necessary for an active power-factorcorrected preregulator and a second-stage dc-to- dc converter. The controller achieves near-unity power factor by shaping the ac input line current waveform to correspond to the ac input-line voltage using average current-mode control. The dc-to-dc converter uses peak current-mode control to perform the step-down power conversion. The PFC stage is leading-edge modulated while the second stage is trailing-edge synchronized to allow for minimum overlap between the boost and PWM switches. This reduces ripple current in the bulk-output capacitor.In order to operate with over three-to-one range of input-line voltages, a line feedforward (VFF) is
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright 2001, Texas Instruments Incorporated
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UCC28500, UCC28501, UCC28502, UCC28503 UCC38500, UCC38501, UCC38502, UCC38503
SLUS419C AUGUST 1999 REVISED NOVEMBER 2001
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Gate Drive Current Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 A Pulsed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 A Input Voltage ISENSE1, ISENSE2, MOUT, VSENSE, OVP/ENBL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V CAI, MOUT, CT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V PKLMT, VERR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V Input Current RSET, RT, IAC, PKLMT, ENA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA VCC (no switching) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Maximum Negative Voltage GT1, GT2, PKLMT, MOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W Storage temperature Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C Junction temperature TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C Lead temperature (soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. All voltages are referenced to GND.
AVAILABLE OPTIONS PFC THRESHOLD TJ PFC UVLO TURNON THRESHOLD (V) 16 40°C to 85°C to 85°C 10.5 16 10.5 16 0°C to 70°C to 70°C 10.5 16 10.5 UVLO2 HYSTERESIS (V) 1.2 1.2 3.0 3.0 1.2 1.2 3.0 3.0 PACKAGED DEVICES PLASTIC DIP (N) UCC28500N UCC28501N UCC28502N UCC28503N UCC38500N UCC38501N UCC38502N UCC38503N SMALL OUTLINE (DW) UCC28500DW UCC28501DW UCC28502DW UCC28503DW UCC38500DW UCC38501DW UCC38502DW UCC38503DW
The DW package is available taped and reeled. Add TR suffix to device type (e.g. UCC38500DWTR) to order quantities of 2000 devices per reel. N PACKAGE (TOP VIEW) DW PACKAGE (TOP VIEW)
VAOUT RT VSENSE OVP/ENBL CT GND VERR ISENSE2 VCC GT2
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VREF VFF IAC MOUT ISENSE1 CAOUT PKLMT SS2 GT1 PWRGND
VAOUT RT VSENSE OVP/ENBL CT GND VERR ISENSE2 VCC GT2
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VREF VFF IAC MOUT ISENSE1 CAOUT PKLMT SS2 GT1 PWRGND
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UCC28500, UCC28501, UCC28502, UCC28503 UCC38500, UCC38501, UCC38502, UCC38503
SLUS419C AUGUST 1999 REVISED NOVEMBER 2001
electrical characteristics TA = 0°C to 70°C for the UCC3850X, 40°C to 85°C for the UCC2850X, TA = TJ, VCC = 12 V, RT = 22 k, CT = 330 pF (unless otherwise noted)
supply current
PARAMETER Supply current, off Supply current, on TEST CONDITIONS VCC turn-on threshold 300 mV VCC = 12 V (no load on GT1 or GT2) MIN TYP 150 4 MAX 300 6 UNITS µA mA
undervoltage lockout
PARAMETER VCC turn-on threshold (UCCx8500/502) UVLO hysteresis (UCCx8500/502) Shunt voltage (UCCx8500/502) VCC turn-on threshold (UCCx8501/503) VCC turn-off threshold UVLO hysteresis (UCCx8501/503) IVCC = 10 mA TEST CONDITIONS MIN 15.4 5.8 15.4 9.7 9.4 0.3 TYP 16 6.3 16.2 10.2 9.7 0.5 17.0 10.8 MAX 16.6 UNITS V V V V V V
voltage amplifier
PARAMETER Input voltage oltage VSENSE bias current Open loop gain High-level output voltage Low-level output voltage TEST CONDITIONS 0°C TA 70°C 40°C TA 85°C VAOUT = 2 V to 5 V ILOAD = 150 µA ILOAD = 150 µA MIN 7.387 7.35 50 5.3 0.00 TYP 7.500 7.50 50 90 5.5 0.05 5.6 0.15 MAX 7.613 7.65 200 UNITS V V nA dB V V
overvoltage protection and enable
PARAMETER Over voltage reference Hysteresis Enable threshold Enable hysteresis TEST CONDITIONS MIN VREF + 0.480 300 1.7 0.1 TYP VREF + 0.500 500 1.9 0.2 MAX VREF + 0.520 600 2.1 0.3 UNITS V mV V V
current amplifier
PARAMETER Input offset voltage Input bias current Input offset current Open loop gain Commonmode rejection ratio High-level output voltage Low-level output voltage Gain bandwidth product VCM = 0 V, VCM = 0 V, VCM = 0 V, VCM = 0 V, TEST CONDITIONS VCAOUT = 3 V VCAOUT = 3 V VCAOUT = 3 V VCAOUT = 2 V to 5 V MIN 6 TYP 0 50 25 90 90 5.6 0.1 7.0 0.2 2.5 7.5 0.5 MAX 6 100 100 UNITS mV nA nA dB dB V V MHz
VCM = 0 V to 1.5 V, VCAOUT = 3 V ILOAD = 120 µA ILOAD = 1 mA See Note 1
NOTES: 1. Ensured by design. Not production tested. 2. See Figure 6 for reference variation. 3. See Figure 5 for reference variation for VCC < 10.8 V.
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