Datasheet
SLUS419C − AUGUST 1999 − REVISED NOVEMBER 2001
3
www.ti.com
electrical characteristics T
A
= 0°C to 70°C for the UCC3850X, –40°C to 85°C for the UCC2850X,
T
A
= T
J
, VCC = 12 V, RT = 22 kΩ, CT = 330 pF (unless otherwise noted)
supply current
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Supply current, off VCC turn-on threshold –300 mV 150 300 µA
Supply current, on VCC = 12 V (no load on GT1 or GT2) 4 6 mA
undervoltage lockout
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
VCC turn-on threshold (UCCx8500/502) 15.4 16 16.6 V
UVLO hysteresis (UCCx8500/502) 5.8 6.3 V
Shunt voltage (UCCx8500/502) I
VCC
= 10 mA 15.4 16.2 17.0 V
VCC turn-on threshold (UCCx8501/503) 9.7 10.2 10.8 V
VCC turn-off threshold 9.4 9.7 V
UVLO hysteresis (UCCx8501/503) 0.3 0.5 V
voltage amplifier
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input voltage
0°C ≤ T
A
≤ 70°C 7.387 7.500 7.613 V
Input voltage
–40°C ≤ T
A
≤ 85°C 7.35 7.50 7.65 V
V
SENSE
bias current 50 200 nA
Open loop gain VAOUT = 2 V to 5 V 50 90 dB
High-level output voltage I
LOAD
= –150 µA 5.3 5.5 5.6 V
Low-level output voltage I
LOAD
= 150 µA 0.00 0.05 0.15 V
PFC overvoltage protection and enable
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Over voltage reference
VREF
+ 0.480
VREF
+ 0.500
VREF
+ 0.520
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
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input offset voltage V
CM
= 0 V, V
CAOUT
= 3 V –6 0 6 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 90 dB
High-level output voltage I
LOAD
= –120 µA 5.6 7.0 7.5 V
Low-level output voltage I
LOAD
= 1 mA 0.1 0.2 0.5 V
Gain bandwidth product See Note 1 2.5 MHz
NOTES: 1. Ensured by design. Not production tested.
2. See Figure 6 for reference variation.
3. See Figure 5 for reference variation for VCC < 10.8 V.