Datasheet

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SLUS577C − SEPTEMBER, 2003 − REVISED MARCH 2009
4
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ELECTRICAL CHARACTERISTICS
T
A
= 0°C to 70°C for the UCC3817A and T
A
= −40°C to 85°C for the UCC2817A, T
A
= T
J,
VCC = 12 V, R
T
= 22 kΩ,
C
T
= 270 pF, (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Over Voltage Protection and Enable Section
Over voltage reference
VREF
+0.48
VREF
+0.50
VREF
+0.52
V
Hysteresis 300 500 600 mV
Enable threshold 1.7 1.9 2.1
V
Enable hysteresis 0.1 0.2 0.3
V
Current Amplifier Section
Input offset voltage V
CM
= 0 V, V
CAOUT
= 3 V −3.5 0 2.5 mV
Input bias current V
CM
= 0 V, V
CAOUT
= 3 V −50 −100
nA
Input offset current V
CM
= 0 V, V
CAOUT
= 3 V 25 100
nA
Open loop gain V
CM
= 0 V, V
CAOUT
= 2 V to 5 V 90
dB
Common-mode rejection ratio V
CM
= 0 V to 1.5 V, V
CAOUT
= 3 V 60 80
dB
High-level output voltage I
L
= −120 µA 5.6 6.5 6.8
V
Low-level output voltage I
L
= 1 mA 0.1 0.2 0.5
V
Gain bandwidth product
(1)
2.5 MHz
Voltage Reference Section
Input voltage
T
A
= 0°C to 70°C 7.387 7.5 7.613
V
Input voltage
T
A
= −40°C to 85°C 7.369 7.5 7.631
V
Load regulation I
REF
= 1 mA to 2 mA 0 10
mV
Line regulation VCC = 10.8 V to 15 V
(2)
0 10
mV
Short-circuit current V
REF
= 0 V −20 −25 −50 mA
Oscillator Section
Initial accuracy T
A
= 25°C 85 100 115 kHz
Voltage stability VCC = 10.8 V to 15 V −1 1 %
Total variation Line, temp 80 120 kHz
Ramp peak voltage 4.5 5 5.5
Ramp amplitude voltage
(peak to peak)
3.5 4 4.5
V
Peak Current Limit Section
PKLMT reference voltage −15 15 mV
PKLMT propagation delay 150 350 500 ns
NOTES: 1. Ensured by design, not production tested.
2. Reference variation for V
CC
< 10.8 V is shown in Figure 8.