Datasheet

UC2856Q
www.ti.com SGLS265A –NOVEMBER 2004– REVISED MAY 2011
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
(1) (2)
UNIT
Supply voltage 40 V
Collector supply voltage 40 V
DC 0.5 A
I
O
Output current (sink or source)
Pulse (0.5 ms) 2 A
Error amplifier input voltage –0.3 V to VIN
Shutdown input voltage –0.3 V to 10 V
Current sense input voltage –0.3 V to 3 V
SYNC output current ±10 mA
Error amplifier output current -5 mA
Soft start sink current 50 mA
Oscillator charging current 5 mA
T
A
= 25°C 1 W
Power dissipation
T
C
= 25°C 2 W
T
J
Operating junction temperature range –55°C to 150°C
T
stg
Storage temperature range –65°C to 150°C
(1) 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.
(2) Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.
ELECTRICAL CHARACTERISTICS
T
A
= –40°C to 125°C, VIN = 15 V, RT = 10 kΩ, CT = 1 nF, and T
A
= T
J
(unless otherwise stated)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
REFERENCE SECTION
Output voltage I
O
= 1 mA, T
J
= 25°C 5.05 5.1 5.15 V
Line regulation voltage VIN = 8 V to 40 V 20 mV
Load regulation voltage I
O
= –1 mA to –10 mA 15 mV
Total output variation Line, Load, and Temperature 5 5.2 V
Output noise voltage f = 10 Hz to 10 kHz, T
J
= 25°C 50 µV
Long term stability 1000 hours,
(2)
T
J
= 25°C 5 25 mV
Short circuit current VREF = 0 V –25 –45 –65 mA
OSCILLATOR SECTION
T
J
= 25°C 180 200 220
Initial accuracy kHz
T
J
= Full range 170 230
Voltage stability VIN = 8 V to 40 V 2%
VCT = 2 V, T
J
= 25°C 7.5 8 8.8
Discharge current mA
VCT = 2 V 6.7 8 8.8
Sync output high level voltage I
O
= –1 mA 2.4 3.6 V
Sync output low level voltage I
O
= 1 mA 0.2 0.4 V
Sync input high level voltage CT = 0 V, RT = VREF 2 1.5 V
Sync input low level voltage CT = 0 V, RT = VREF 1.5 0.8 V
Sync input current CT = 0 V, RT = VREF,V
SYNC
= 5 V 1 10 µA
Sync delay to outputs CT = 0 V RT = VREF, V
SYNC
= 0.8 V to 2 V 50 100 ns
(1) All voltages are with respect to GND. Currents are positive into, negative out of the specified terminal.
(2) This parameter, although specified over the recommended operating conditions, is not 100% tested in production.
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