UC2578
UC3578
CONNECTION DIAGRAM
ABSOLUTE MAXIMUM RATINGS
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +72V
EAINV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +10V
EAOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +10V
SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +10V
DIODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VCC
VGG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VCC +14V
CS. . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC – 5V to VCC +0.6V
DIL-16, SOIC-16 (Top View)
N or DP Packages
I
OUT Pulsed . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.8A to +0.6A
SRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.6V to VCC
Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages.
Note: The four GND pins are internally connected.
ELECTRICAL CHARACTERISTICS: Unless otherwise specified VCC = 14V, VGG = 14V, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
Oscillator Section
Frequency
VCC = 14V to 72V, EAINV = 1.9V, TJ = 25°C
VCC = 11V to 14V, Over Temperature
100
90
110
120
120
kHz
kHz
Error Amplifier Section
EAINV
EAOUT = EAINV
1.97
2
100
80
6.2
0.8
1
2.03
300
V
nA
dB
V
IEAINV
EAOUT = EAINV
EAVOL
EAOUT/EAINV, 25°C
70
EAOUT High
EAINV ≤ 1.9V, IEAOUT = –100µA
EAINV ≥ 2.1V, IEAOUT = 100µA
TJ = 25°C, F = 100kHz
EAOUT = EAINV, VCC = 14V
5.5
EAOUT Low
1.1
V
Unity Gain Bandwidth
PSRR, EAOUT
Current Sense Comparator Section
Threshold (Referred to VCC)
Input Bias Current
Propagation Delay
Blanking Time
0.85
80
MHz
dB
90
0.4
0.5
0.2
0.7
200
0.6
1
V
CS = VCC – 0.4V
µA
µs
ns
VOVERDRIVE = 250mV
VOVERDRIVE = 250mV
1.2
300
75
Gate Drive Output Section
VOH
IOUT = –200mA
IOUT = 20mA
9.5
11
0.2
1.5
40
V
V
VOL
0.36
2
I
OUT = 200mA
V
Rise Time
TJ = 25°C, CLOAD = 1nF
TJ = 25°C, CLOAD = 1nF
70
70
ns
ns
Fall Time
40
Pulse Width Modulator Section
Maximum Duty Cycle
Minimum Duty Cycle
Modulator Gain
EAINV ≤ 1.9V
85
90
0
%
%
EAINV ≥ 2.1V
EAOUT = 2.5V to 3.5V
30
%/V
Undervoltage Lockout Section
Start Threshold
OUT – SRC, EAINV ≤ 1.9V, SRC = 0V
10
11
2
12
V
V
UVLO Hysteresis
1.5
2.5
2