UC1854J UNITRODE, UC1854J Datasheet - Page 5
UC1854J
Manufacturer Part Number
UC1854J
Description
UNITRODE
Manufacturer
UNITRODE
Datasheets
1.UC1854J.pdf
(13 pages)
2.UC1854J.pdf
(9 pages)
3.UC1854J.pdf
(13 pages)
4.UC1854J.pdf
(9 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UC1854J/883B
Manufacturer:
TI
Quantity:
766
Company:
Part Number:
UC1854J/883B 5962-9326101MEA
Manufacturer:
HAR
Quantity:
1
PIN DESCRIPTIONS (cont.)
GT Drv (Pin 16) (gate drive): The output of the PWM is a
totem pole MOSFET gate driver on GT Drv. This output is
internally clamped to 15V so that the IC can be operated
with V
least 5 ohms to prevent interaction between the gate im-
TYPICAL CHARACTERISTICS at T
Open-Loop
ns
Multiplier
Output
degrees
Current Amplifier Gain and Phase vs Frequency
Margin
Phase
Gain
A
dB
CC
700
600
500
400
300
200
100
100
600
500
400
300
200
0
as high as 35V. Use a series gate resistor of at
0
0
120
100
0
-20
Multiplier Output vs Voltage on Mult
80
60
40
20
0
Gate Drive Rise and Fall Time
0.1
100
0.01
Mult Out=0V
200
Mult Out=1
1
Fall Time
Load Capacitance, F
300
0.02
I
AC
Mult Out=2V
10
Frequency
400
V
Rise Time
, A
RMS
kHz
Mult Out=3V
=2V, VA Out=5V
500
0.03
100
600
A
= T
1000
0.04
700
J
= 25 C
800
10000
0.05
5
pedance and the GT Drv output driver that might cause
the GT Drv output to overshoot excessively. Some over-
shoot of the GT Drv output is always expected when driv-
ing a capacitive load.
Open-Loop
Duty
Cycle
degrees
Margin
Phase
Gain
Voltage Amplifier Gain and Phase vs Frequency
dB
100%
95%
90%
85%
80%
75%
70%
1
120
100
Oscillator Frequency vs R
-20
80
60
40
20
Frequency
0
0.1
kHz
Gate Drive Maximum Duty Cycle
1000
100
10
1
1
10
Frequency
R
10
SET
kHz
R
10nF
, k
SET
10
100
, k
5nF
SET
3nF
1000
and C
100pF
500pF
200pF
1nF
2nF
100
UC1854
UC2854
UC3854
10000
T
100