UCC1890
UCC2890
UCC3890
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAMS
IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5mA
Current into TON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5mA
Voltage on VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Current into TOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250µA
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
DIL-8, SOIC-8 (Top View)
J, N, or D Packages
Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages.
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to 125°C for
UCC1890, –40°C to 85°C for the UCC2890, and 0°C to 70°C for the UCC3890. No load at DRIVE pin (CLOAD = 0), TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
General
VDD Zener Voltage
IDD = 4.75mA,ITON = 0mA
8.3
9.0
9.4
2.0
V
Minimum Operating Current ITON
Undervoltage Lockout
Minimum Voltage to Start
Minimum Voltage after Start
Hysteresis
IDD = –1mA, F = 150kHz
1.65
mA
FB = 0
FB = 0
FB = 0
FB = 0
7.8
5.75
1.8
8.6
6.3
2.3
0.4
9.2
6.65
2.6
V
V
V
V
VDD – VSTART
0.2
0.7
Oscillator
Amplitude
ITON = 3mA; ITOFF = 50µA; VFB = 0V CT = 100pF
Overdrive = 200mV
3.1
3.4
80
50
3.7
200
100
V
CT to DRIVE High Delay
CT to DRIVE Low Delay
Charge Coefficient ICT/ITON
Discharge Coefficent ICT/ITOFF
Driver
ns
ns
Overdrive = 200mV
ITON = 3mA; VCT = 3.0V
0.135 0.15 0.165 µA/µA
ITOFF = 50µA; VCT = 3.0V
0.95
1.00
1.05 µA/µA
VOL
I = 100mA (Note 1)
I = –100mA referred to VDD (Note 1)
CL = 1nF
0.7
–1.5
35
1.8
V
V
VOH
–2.9
Rise Time
70
60
ns
ns
Fall Time
CL = 1nF
30
Line Voltage Detection
Minimum ITON for Fault
ITON Detector Hysteresis
On Time During Fault
VOUT Error Amplifier
Reference Level
1.0
1.5
110
0.5
2.0
mA
µA
µs
ITOFF = 50µA, ICT = 25µA, TJ = 25°C
ITOFF = 50µA, ICT = 25µA, Over Temperature
ITOFF = 50µA
1.20
1.15
0.3
1.25
1.25
0.4
1.30
1.35
0.5
V
V
Voltage at TOFF
Regulation gm
V
ITOFF = 50µA (Note 2)
2.0
4.0
7.7
mA/V
Current Sense Amplifier
Gain
VCS = 90 – 110mV
11.8
–5
12.5
0
13.0
5
V/V
mV
V
Input Offset Voltage
Input Voltage for CS Amplifier Enabled
VCS = 90 – 110mV
ITON = 3mA, Referred to VDD
–1.5
–0.8
–0.8
Input Voltage for CS Amplifier Disabled ITON = 3mA, Referred to VDD
–0.3
V
Note 1: VDD forced to 100mV below VDD Zener Voltage
∆ICT
Note 2: gm is defined as
for the values of VFB where the error amp is in regulation. The two points used to calculate gm
∆VFB
are for ICT at 65% amd 35% of its maximum value.
2
TI [ TEXAS INSTRUMENTS ]
