3
UCC15701/2
UCC25701/2
UCC35701/2
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, V
DD
= 11V, RT = 60.4k, C
T
= 330pF, C
REF
=C
VDD
=
0.1m F, V
FF
= 2.0V, and no load on the outputs.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Line Sense
Vth High Line Comparator 3.9 4 4.1 V
Vth Low Line Comparator 0.5 0.6 0.7 V
Input Bias Current –100 100 nA
Oscillator Section
Frequency V
FF
= 0.8V to 3.2V 90 100 110 kHz
Frequency V
FF
= 0.6V to 3.4V (Note 1) 90 100 110 kHz
SYNC VIH 2V
SYNC VIL 0.8 V
SYNC Input Current VSYNC = 2.0V 3 10 mA
RT Voltage VFF = 0.4V 0.5 0.6 0.7 V
VFF = 0.8V 0.75 0.8 0.85 V
VFF = 2.0V 1.95 2.0 2.05 V
VFF = 3.2V 3.15 3.2 3.25 V
VFF = 3.6V 3.3 3.4 3.5 V
C
T
Peak Voltage VFF = 0.8V (Note 1) 0.8 V
VFF = 3.2V (Note 1) 3.2 V
C
T
Valley Voltage (Note 1) 0 V
Soft Start/Shutdown/Duty Cycle Control Section
I
SS
Charging Current 10 18 30 mA
I
SS
Discharging Current 300 500 750 mA
Saturation V
DD
= 11V, IC Off 25 100 mV
Fault Counter Section
Threshold Voltage VFF = 0.8V to 3.2V 3.8 4 4.2 V
Saturation Voltage VFF = 0.8V to 3.2V 100 mV
Count Charging Current 10 18 30 mA
Current Limit Section
Input Bias Current –100 0 100 nA
Current Limit Threshold 180 200 220 mV
Shutdown Threshold 500 600 700 mV
Pulse Width Modulator Section
FB Pin Input Impedance VFB = 3V 30 50 100 kW
Minimum Duty Cycle VFB <= 1V 0 %
Maximum Duty Cycle VFB >= 4.5V, VSCLAMP >= 2.0V 95 99 100 %
PWM Gain VFF = 0.8V 35 50 70 %/V
Volt Second Clamp Section
Maximum Duty Cycle VFF = 0.8V, VSCLAMP = 0.6V 69 74 79 %
Minimum Duty Cycle VFF = 3.2V, VSCLAMP = 0.6V 17 19 21 %
Output Section
VOH I
OUT
= –100mA, (V
DD
–V
OUT
) 0.4 1 V
VOL I
OUT
= 100mA 0.4 1 V
Rise Time C
LOAD
= 1000pF 20 100 ns
Fall Time C
LOAD
= 1000pF 20 100 ns
Note 1: Ensured by design. Not 100% tested in production.
