Datasheet

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SLUS456D − APRIL 1999 - REVISED AUGUST 2002
2
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description (continued)
The UCC3808A family offers a variety of package options, 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.
The UCC3808A is an enhanced version of the UCC3808 family. The significant difference is that the A versions
feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle during the
oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle and helps minimize
filter capacitor values and current sense delay.
ORDERING INFORMATION
T
A
= T
J
Packaged Devices
T
A
= T
J
UVLO Option SOIC (D){ PDIP (N) TSSOP (PW){
−40°C to 85°C
12.5 V/8.3 V UCC2808AD−1 UCC2808AN−1 UCC2808APW−1
−40°C to 85°C
4.3 V/4.1 V UCC2808AD−2 UCC2808AN−2 UCC2808APW−2
0°C to 70°C
12.5 V/8.3 V UCC3808AD−1 UCC3808AN−1 UCC3808APW−1
0°C to 70°C
4.3 V/4.1 V UCC3808AD−2 UCC3808AN−2 UCC3808APW−2
†
D (SOIC−8) and PW (TSSOP−8) packages are available taped and reeled. Add TR suffix to device type (e.g.
UCC3808ADTR−1) 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 T
A
= 25°C (N package) 1 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power dissipation at T
A
= 25°C (D package) 650 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power dissipation at T
A
= 25°C (PW package) 400 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature, T
stg
−65°C to150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Junction temperature, T
J
−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.
electrical characteristics, T
A
= 0°C to 70°C for the UCC3808A-x, −40°C to 85°C for the UCC2808A-x,
VDD = 10 V (see Note 6), 1-µF capacitor from VDD to GND, R = 22 kΩ, C = 330 pF T
A
= T
J
, (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Oscillator Section
Oscillator frequency 175 194 213 kHz
Oscillator amplitude/VDD See Note 1 0.44 0.5 0.56 V/V
NOTES: 1. Measured at RC. Signal amplitude tracks VDD.
6. For UCCx808A−1, set VDD above the start threshold before setting at 10 V.