3
UCC1895
UCC2895
UCC3895
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, VDD=12V, RT=82kW, CT=220pF, RDELAB=10kW,
RDELCD=10kW,C
REF
=0.1mF, C
VDD
=1.0mF, no load at outputs. T
A
=T
J
. T
A
= 0°C to 70°C for UCC3895x, –40°C to +85°C for
UCC2895x, and –55°C to +125°C for UCC1895x.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Voltage Reference Section
Output Voltage T
J
= 25°C 4.94 5.00 5.06 V
10V < VDD < 17.5V, 0mA < IREF < 5mA,
Temperature
4.85 5 5.15 V
Short Circuit Current REF = 0V, T
J
= 25°C 10 20 mA
Error Amplifier Section
Common Mode Input Voltage Range –0.1 3.6 V
Offset Voltage –7 7 mV
Input Bias Current (EAP, EAN) –1 1 mA
EAOUT VOH EAP–EAN = 500mV, I
EAOUT
= –0.5mA 4.0 4.5 5.0 V
EAOUT VOL EAP–EAN = –500mV, I
EAOUT
= 0.5mA 0 0.2 0.4 V
EAOUT Source Current EAP–EAN = 500mV, EAOUT= 2.5V 1.0 1.5 mA
EAOUT Sink Current EAP–EAN = –500mV, EAOUT= 2.5V, (Note 4) 2.5 4.5 mA
Open Loop DC Gain 75 85 dB
Unity Gain Bandwidth (Note 3) 5.0 7.0 MHz
Slew Rate EAN from 1V to 0V, EAP = 500mV,
EAOUT from 0.5V to 3.0V, (Note 3)
1.5 2.2 V/ms
No Load Comparator Turn-Off Threshold 0.45 0.50 0.55 V
No Load Comparator Turn-On Threshold 0.55 0.60 0.69 V
No Load Comparator Hysteresis 0.035 0.100 0.165 V
Oscillator Section
Frequency T
J
= 25°C 473 500 527 kHz
Total Variation Line, Temperature (Note 3) 2.5 5 %
SYNC VIH 2.05 2.10 2.25 V
SYNC VIL 1.85 1.90 1.95 V
SYNC VOH I
SYNC
= –400mA, CT = 2.6V 4.1 4.5 5.0 V
SYNC VOL I
SYNC
= 100mA, CT = 0V 0.0 0.5 1.0 V
SYNC Output Pulse Width SYNC Load = 3.9kW and 30pF in parallel 85 135 ns
RT Voltage 2.9 3 3.1 V
CT Peak Voltage 2.25 2.35 2.50 V
CT Valley Voltage UCC2895, UCC3895 0.0 0.2 0.4 V
CT Valley Voltage UCC1895 0.0 0.2 0.6 V
PWM Comparator Section
EAOUT to RAMP Input Offset Voltage RAMP = 0V, DELAB = DELCD = REF 0.72 0.85 1.05 V
Minimum Phase Shift
(OUTA to OUTC, OUTB to OUTD)
RAMP = 0V, EAOUT = 650mV (Note 1) 0.00 0.85 1.40 %
RAMP to OUTC/OUTD Delay RAMP from 0V to 2.5V, EAOUT = 1.2V,
DELAB = DELCD = REF (Note 2)
70 120 ns
RAMP Bias Current RAMP < 5V, CT < 2.2V –5 5 mA
RAMP Sink Current RAMP = 5V, CT < 2.6V 12 19 mA
Current Sense Section
CS Bias Current 0 < CS , 2.5V, 0 < ADS < 2.5V –4.5 20 mA
Peak Current Threshold 1.90 2.00 2.10 V
Overcurrent Threshold 2.4 2.5 2.6 V
CS to Output Delay CS from 0 to 2.3V, DELAB = DELCD = REF 75 110 ns
