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Part: UCC3808N-1
Category:
Power Management
-> PWM Power Supply
-> Current Mode
Description: ti UCC3808-1, Low Power Current Mode Push-pull PWM
Company: Texas Instruments, Inc.
Datasheet: Download UCC3808N-1 datasheet File size : 375 kB
Request For quote: Find where to buy UCC3808N-1
Datasheet text preview:
UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 S LOW POWER CURRENT MODE PUSH-PULL PWM
LUS168D APRIL 1999 REVISED AUGUST 2002
D Dual Output Drive Stages in Push-Pull D D D D D D D
Configuration 130-µA Typical Starting Current 1-mA Typical Run Current Operation to 1-MHz Internal Soft Start On Chip Error Amplifier With 2-MHz Gain Bandwidth Product On Chip VDD Clamping Output Drive Stages Capable Of 500-mA Peak Source Current, 1-A Peak Sink Current
D OR N PACKAGE (TOP VIEW) COMP FB CS RC 1 2 3 4 8 7 6 5 VDD OUTA OUTB GND
PW PACKAGE (TOP VIEW) OUTA VDD COMP FB 1 2 3 4 8 7 6 5 OUTB GND RC CS
description
The UCC3808 is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808 contains all of the control and drive circuitry required for off-line or dc-to-dc fixed frequency current-mode switching power supplies with minimal external parts count. The UCC3808 dual output drive stages are arranged in a push-pull configuration. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to 200 ns depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle to less than 50%. (continued)
block diagram
FB 2 COMP 1 CS 3 8 OVERCURRENT COMPARATOR 0.75 V 2.0 V 2.2 V 7 VDD OK S Q R 1.2R VDD1 V S Q R 0.5 V SOFT START VOLTAGE REFERENCE VDD R 6 OUTB PWM COMPARATOR PWM LATCH S Q R Q T Q OSCILLATOR OUTA 0.5 V 22 k PEAK CURRENT COMPARATOR 14 V VDD
SLOPE = 1 V/ms 5 GND
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Note: Pinout shown is for SOIC and PDIP packages. TSSOP pinout is different.
RC
UDG-02116
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 2002, Texas Instruments Incorporated
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UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 S LOW POWER CURRENT MODE PUSH-PULL PWM
LUS168D APRIL 1999 REVISED AUGUST 2002
description (continued)
The UCC3808 family offers a variety of package temperature range options, and choice of undervoltage lockout levels. The family has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are shown in the table below. Table 1.
Part Number UCCx8081 UCCx8082 Turn on Threshold 12.5 V 4.3 V ORDERING INFORMATION Packaged Devices TA = TJ to 85°C 40°C to 85°C 0°C to 70°C to 70°C UVLO Option 12.5 V/8.3 V 4.3 V/4.1 V 12.5 V/8.3 V SOIC (D) UCC2808D1 UCC2808D2 UCC3808D1 PDIP (N) UCC2808N1 UCC2808N2 UCC3808N1 TSSOP (PW) UCC2808PW1 UCC2808PW2 UCC3808PW1 Turn off Threshold 8.3 V 4.1 V
4.3 V/4.1 V UCC3808D2 UCC3808N2 UCC3808PW2 D (SOIC8) and PW (TSSOP8) packages are available taped and reeled. Add TR suffix to device type (e.g. UCC3808DTR1) to order quantities of 2500 devices per reel for SOIC-8 and 2000 devices per reel for TSSOP-8.
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage (IDD 10 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V Supply current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA OUTA/OUTB source current (peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 A OUTA/OUTB sink current (peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 A Analog inputs (FB, CS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to VDD+0.3 V, not to exceed 6 V Power dissipation at TA = 25°C (N Package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W Power dissipation at TA = 25°C (D Package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 mW Power dissipation at TA = 25°C (PW Package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 mW Storage temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C Junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 150°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 the Power Supply Control Data Book (TI Literature Number SLUD003) for thermal limitations and considerations of packages.
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UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 S LOW POWER CURRENT MODE PUSH-PULL PWM
LUS168D APRIL 1999 REVISED AUGUST 2002
electrical characteristics, TA = 0°C to 70°C for the UCC3808x, 40°C to 85°C for the UCC2808x and 55°C
to 125°C for the UCC1808x, VDD = 10 V (See Note 6), 1 µF capacitor from VDD to GND, R = 22 k, C = 330 pF, TA = TJ, (unless otherwise specified)
oscillator section
PARAMETER Oscillator frequency Oscillator amplitude/VDD See Note 1 TEST CONDITIONS MIN 175 0.44 TYP 194 0.5 MAX 213 0.56 UNITS kHz V/V
error amplifier section
PARAMETER Input voltage Input bias current Open loop voltage gain COMP sink current COMP source current FB = 2.2 V, FB = 1.3 V, COMP = 1 V COMP = 3.5 V COMP = 2 V TEST CONDITIONS MIN 1.95 1 60 0.3 0.2 80 2.5 0.5 TYP 2 MAX 2.05 1 UNITS V µA dB mA mA
PWM section
PARAMETER Maximum duty cycle Minimum duty cycle COMP = 0 V TEST CONDITIONS Measured at OUTA or OUTB MIN 48% TYP 49% MAX 50% 0% UNITS
current sense section
PARAMETER Gain Maximum input signal CS to output delay CS source current Over current threshold COMP to CS offset CS = 0 V NOTES: 1. Measured at RC. Signal amplitude tracks VDD. DV COMP , 0 v V v 0.4 V , 2. Gain is defined by: A + CS DV CS 3. Parameter measured at trip point of latch with FB at 0V. 4. Start threshold and zener shunt threshold track one another. 5. For UCCx8081, set VDD above the start threshold before setting at 10 V. 6. Does not include current in the external oscillator network. See Note 2 COMP = 5 V, COMP = 3.5 V, See Note 3 CS from 0 to 600 mV 200 0.7 0.35 0.75 0.8 0.8 1.2 TEST CONDITIONS MIN 1.9 0.45 TYP 2.2 0.5 100 MAX 2.5 0.55 200 UNITS V/V V ns nA V V
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