Datasheet

ELECTRICAL CHARACTERISTICS
UCC284-EP
SLVS862A – NOVEMBER 2008 – REVISED NOVEMBER 2008 ....................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
T
A
= – 55 ° C to 100 ° C for the UCC284, VIN = VOUT – 1.5 V, I
OUT
= 0 mA, C
OUT
= 4.7 µ F, and CT = 0.015 µ F. For
UCC284-ADJ, VOUT is set to – 3.3 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Peak current limit T
A
= 25 ° C, VOUT = 0 V 0.7 1.1 1.5 A
Over all temperature conditions 0.5 1.7
Overcurrent threshold 0.55 0.7 0.9 A
Current limit duty cycle VOUT = 0 V 2.5 4 %
Overcurrent time out, t
ON
T
A
= 25 ° C, VOUT = 0 V 300 500 700 µ s
Over all temperature conditions 300 720
UCC284-12 Fixed 12-V 0.5-A Regulation Section
T
A
= 25 ° C – 12.18 – 12 – 11.82 V
Output voltage
Over all conditions – 12.24 – 11.64 V
Line regulation VIN = – 12.5 V to – 15 V 5 15 mV
Load regulation I
OUT
= 0 mA to 0.5 A 0.1 0.3 %
Output noise voltage T
A
= 25 ° C, BW = 10 Hz to 10 kHz 200 µ VRMS
I
OUT
= 0.5 A, VOUT = – 11.6 V 0.15 0.5 V
Dropout voltage, VOUT - VIN
I
OUT
= 50 mA, VOUT = – 11.6 V 15 50 mV
UCC284-12 Fixed – 12-V 0.5-A Power Supply Section
Input voltage range – 15 – 12.5 V
Quiescent current VIN = -15 V 220 350 µ A
VIN = – 13 V, SD/CT = 0 V
15 45 µ A
T
A
= 0 ° C to 100 ° C
(4)
Quiescent current in shutdown
VIN = – 13 V, SD/CT = 0 V
100 µ A
T
A
= – 55 ° C to 0 ° C
(4)
(4) Ensured by design. Not production tested.
T
A
= – 55 ° C to 100 ° C for the UCC284, VIN = VOUT – 1.5 V, I
OUT
= 0 mA, C
OUT
= 4.7 µ F, and CT = 0.015 µ F. For
UCC284-ADJ, VOUT is set to – 3.3 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
UCC284-12 Fixed – 12 V – 0.5-A Power Supply Section (continued)
Shutdown threshold At shutdown pin (SD/CT) – 1.0 – 0.7 – 0.4 V
Shutdown input current SD/CT = 0 V 5 10 25 µ A
Output leakage in shutdown VIN = – 15 V, VOUT = 0 V
(1)
1 50 µ A
Overtemperature shutdown 140 ° C
Overtemperature hysteresis 20 ° C
UCC284-12 Fixed – 12-V 0.5-A Current Limit Section
Peak current limit VOUT = 0 V 0.7 1.1 1.5 A
Overcurrent threshold 0.55 0.7 0.9 A
Current limit duty cycle VOUT = 0 V 2.5 4 %
Overcurrent time out, t
ON
VOUT = 0 V 300 500 700 µ s
UCC284-ADJ Adjustable 0.5-A Regulation Section
T
A
= 25 ° C – 1.27 – 1.25 – 1.23 V
Reference voltage
Over temperature – 1.275 – 1.215 V
Line regulation VIN = – 3.5 V to – 15 V, VOUT = VOUTS 0.5 3 mV
Load regulation I
OUT
= 0 mA to 0.5 A 0.1 0.18 %
Output noise voltage BW = 10 Hz to 10 kHz, T
A
= 25 ° C 200 µ VRMS
(1) In the application during shutdown mode, output leakage current adds to quiescent current.
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Product Folder Link(s): UCC284-EP