Datasheet

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ELECTRICAL CHARACTERISTICS
UC1854A
UC2854A, UC2854B
UC3854A, UC3854B
SLUS329E – MONTH 2003 – REVISED JANUARY 2008
V
CC
= 18 V, R
T
= 8.2 k Ω , C
T
= 1.5 nF, V
PKLMT
= 1 V, V
VRMS
= 1.5 V, I
IAC
= 100 µ A, I
ISENSE
= 0 V, V
CAO
= 3.5 V, V
VAO
= 5 V,
V
VSENSE
= 3 V, – 40 ° C < T
A
< 85 ° C for the UC2854A and UC2854B, and 0 ° C < T
A
< 70 ° C for the UC3854A and UC3854B,
and T
A
= T
J
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OVERALL
CAO = 0 V, VAO = 0 V,
Supply current, off 250 400 µ A
V
CC
= V
UVLO
– 0.3 V
Supply current, on 12 18 mA
UCx854A 15.0 16.0 17.5
V
CC
turn-on threshold voltage
UCx854B 8.0 10.5 11.2
UCx854A 9 10 12
V
CC
turn-off threshold voltage
UCx854B 7.8 10.3 11.0 V
UCx854A 5 6 7
V
CC
hysteresis
UCx854B 0.10 0.22 0.50
V
CC
clamp I
VCC
= I
VCC(on)
+ 5 mA 18 20 22
VOLTAGE AMPLIFIER
Input voltage 2.9 3.0 3.1 V
V
SENSE
bias current – 500 — 25 500 nA
Open loop gain 2 V ≤ V
OUT
≤ 5 V 70 100 dB
V
OH
High-level output voltage I
LOAD
= – 500 µ A 6
V
V
OL
Low-level output voltage I
LOAD
= 500 µ A 0.3 0.5
I
SC
Output short-circuit current V
OUT
= 0 V 1.5 3.5 mA
Gain bandwidth product
(1)
f
IN
= 100 kHz, 10 mVp-p 1 MHz
CURRENT AMPLIFIER
V
CM
= 0 V, T
A
= 25 ° C – 4 0
Input offset voltage mV
V
CM
= 0 V, Overtemperature – 5.5 0
I
SENSE
Input bias current V
CM
= 0 V – 500 500 nA
Open loop gain 2 V ≤ V
OUT
= 6 V 80 110 dB
V
OH
High-level output voltage I
LOAD
= – 500 µ A 8
V
V
OL
Low-level output voltage I
LOAD
= 500 µ A 0.3 0.5
I
SC
Output short-circuit current V
OUT
= 0 V 1.5 3.5 mA
CMRR Common mode rejection range – 0.3 5.0 V
Gain bandwidth product
(1)
f
IN
= 100 kHz, 10 mVp-p 3 5 MHz
REFERENCE
I
REF
= 0 mA, T
A
= 25 ° C 7.4 7.5 7.6
Output voltage V
I
REF
= 0 mA 7.35 7.50 7.65
Load regulation 1 mA ≤ I
REF
≤ 10 mA 0 8 20
mV
Line regulation 12 V ≤ V
CC
≤ 18 V 0 14 25
I
SC
Short circuit current V
REF
= 0 V 25 35 60 mA
(1) Ensured by design. Not production tested.
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Product Folder Link(s): UC1854A UC2854A, UC2854B UC3854A, UC3854B