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(3) Oscillator frequency is twice the output frequency.
4
OSC
T T
f
R C
=
´
(4) Current sense gain A is defined by:
COMP
CS
V
A
V
D
=
D
, 0 V ≤ V
CS
≤ 0.8 V.
ELECTRICAL CHARACTERISTICS
UCC2810
UCC3810
SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007
All parameters are the same for both channels, –40°C ≤ T
A
≤ 85°C for the UCC2810, 0°C ≤ T
A
≤ 70°C for the UCC3810,
V
CC
= 10 V
(1)
; R
T
= 150 k Ω , C
T
= 120 pF; no load; T
A
= T
J;
(unless otherwise specified)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
REFERENCE
T
J
= 25°C 4.925 5.000 5.075
V
CC
Output voltage V
T
J
= full range, 0 mA ≤ I
REF
≤ 5 mA 4.85 5.00 5.10
Load regulation 0 mA ≤ I
REF
≤ 5 mA 5 30
mV
UVLO stop threshold voltage, 12
Line regulation
0.5 V ≤ V
CC
≤ V
SHUNT
Output noise voltage
(2)
10Hz <f< 10 kHz, T
J
= 25°C 235 µV
Long term stability
(2)
TA = 125°C, 1000 hours 5 mV
I
O(SC)
Output short circuit current -8 -25 mA
OSCILLATOR
R
T
= 30 k Ω , C
T
= 120 pF 860 980 1100
f
OSC
Oscillator frequency
(3)
kHz
R
T
= 150 k Ω , C
T
= 120 pF 190 220 250
Temperature stability
(2)
2.5%
Peak voltage 2.5
Valley voltage 0.05
V
Peak-to-peak amplitude 2.25 2.45 2.65
SYNC threshold voltage 0.80 1.65 2.20
SYNC input current SYNC = 5 V 30 µA
ERROR AMPLIFIER
V
FB
FB input voltage COMP = 2.5 V 2.44 2.50 2.56 V
I
FB
FB input bias current ±1 µA
Open loop voltage gain 60 73 dB
f
GAIN
Unity gain bandwidth
(2)
2 MHz
I
SINK
Sink current, COMP FB = 2.7 V, COMP = 1 V 0.3 1.4 3.5
I
SRCE
Source current, COMP FB = 1.8 V, COMP = 4 V -0.2 -0.5 -0.8 mA
Minimum duty cycle COMP = 0 V 0%
FB = 1.8 V, 5
Soft-start rise time, COMP ms
Rise from 0.5 V to (REF – 1.5 V)
CURRENT SENSE
Gain
(4)
1.20 1.55 1.80 V/V
Maximum input signal
(5)
COMP = 5 V 0.9 1.0 1.1 V
I
CS
Input bias current, CS ±200 nA
CS steps from 0 V to 1.2 V, 75
Propagation delay time (CS to OUT)
COMP = 2.5 V
ns
Blank time, CS
(6)
55
Overcurrent threshold voltage, CS 1.35 1.55 1.85
V
COMP-to-CS offset voltage CS = 0 V 0.45 0.90 1.35
(1) For UCC3810, adjust V
CC
above the start threshold before setting at 10 V.
(2) Ensured by design. Not production tested.
(5) Parameter measured at trip point of latch with FB = 0 V.
(6) CS blank time is measured as the difference between the minimum non-zero on-time and the CS-to-OUT delay.
3
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