uc3844bvnguc3845bd ON Semiconductor, uc3844bvnguc3845bd Datasheet - Page 3

• Manufacturer Part Number: uc3844bvnguc3845bd
• Description: Current Mode Controller
• Manufacturer: ON Semiconductor

5. Adjust V
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
7. This parameter is measured at the latch trip point with V
8. Comparator gain is defined as: A
ELECTRICAL CHARACTERISTICS
T
ERROR AMPLIFIER SECTION
CURRENT SENSE SECTION
OUTPUT SECTION
UNDERVOLTAGE LOCKOUT SECTION
A
Voltage Feedback Input (V
Input Bias Current (V
Open Loop Voltage Gain (V
Unity Gain Bandwidth (T
Power Supply Rejection Ratio (V
Output Current
Output Voltage Swing
Current Sense Input Voltage Gain (Notes 7 & 8)
Maximum Current Sense Input Threshold (Note 7)
Power Supply Rejection Ratio
Input Bias Current
Propagation Delay (Current Sense Input to Output)
Output Voltage
Output Voltage with UVLO Activated (V
Output Voltage Rise Time (C
Output Voltage Fall Time (C
Startup Threshold
Minimum Operating Voltage After Turn-On
T
is the operating ambient temperature range that applies [Note 6], unless otherwise noted.)
Sink (V
Source (V
High State (R
Low State (R
(UC284XB, UC384XB)
(UC384XBV)
(UC284XB, UC384XB)
(UC384XBV)
(V
Low State (I
High State (I
UCX844B, BV
UCX845B, BV
UCX844B, BV
UCX845B, BV
low
(UC284XB, UC384XB)
(UC384XBV)
CC
= 0°C for UC3844B, UC3845B
= - 25°C for UC2844B, UC2845B
= - 40°C for UC3844BV, UC3845BV
= 12 V to 25 V) (Note 7)
O
CC
= 1.1 V, V
O
above the Startup threshold before setting to 15 V.
= 5.0 V, V
(I
(I
(I
(I
L
L
Sink
Sink
Sink
Source
Source
Source
= 15 k to V
= 15 k to ground, V
= 20 mA)
= 200 mA, UC284XB, UC384XB)
= 200 mA, UC384XBV)
FB
FB
= 20 mA, UC284XB, UC384XB)
= 20 mA, UC384XBV)
= 200 mA)
= 5.0 V)
Characteristic
FB
J
= 2.7 V)
= 25°C)
O
= 2.3 V)
O
ref
L
= 2.5 V)
L
= 1.0 nF, T
= 2.0 V to 4.0 V)
, V
= 1.0 nF, T
CC
FB
V
= 2.7 V)
= DV Output/Compensation
UC3844B, UC3845B, UC2844B, UC2845B
= 12 V to 25 V)
FB
CC
DV Current Sense Input
= 2.3 V)
J
J
(V
= 6.0 V, I
= 25°C)
= 25°C)
CC
= 15 V [Note 5], R
T
high
Sink
= + 70°C for UC3844B, UC3845B
= + 85°C for UC2844B, UC2845B
= +105°C for UC3844BV, UC3845BV
= 1.0 mA)
http://onsemi.com
FB
= 0 V.
T
3
= 10 k, C
t
V
PLH(In/Out)
Symbol
V
OL(UVLO)
I
PSRR
PSRR
Source
CC(min)
A
I
V
V
V
V
V
BW
Sink
V
V
A
I
VOL
I
IB
OH
IB
OH
t
t
FB
OL
OL
V
th
r
f
th
T
= 3.3 nF. For typical values T
- 0.5
2.45
2.85
Min
0.7
2.0
5.0
0.9
7.8
9.0
7.0
65
60
13
12
15
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
UC284XB
- 0.1
- 2.0
-1.0
13.5
13.4
Typ
150
2.5
1.0
6.2
0.8
3.0
1.0
0.1
1.6
0.1
8.4
7.6
90
70
12
70
50
50
16
10
-
-
-
-
-
Max
2.55
-1.0
3.15
-10
300
150
150
1.1
1.1
0.4
2.2
1.1
9.0
8.2
17
11
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- 0.5
2.42
2.85
2.85
0.85
12.9
14.5
A
Min
0.7
2.0
5.0
0.9
7.8
8.5
7.0
65
60
13
12
-
-
-
-
-
-
-
-
-
-
-
-
= 25°C, for min/max values
UC384XB, XBV
- 0.1
- 2.0
-1.0
13.5
13.4
Typ
150
2.5
1.0
6.2
0.8
0.8
3.0
3.0
1.0
1.0
0.1
1.6
1.6
0.1
8.4
7.6
90
70
12
70
50
50
16
10
-
- 2.0
Max
2.58
3.15
3.25
17.5
11.5
-10
300
150
150
1.1
1.2
1.1
1.1
0.4
2.2
2.3
1.1
9.0
8.2
-
-
-
-
-
-
-
-
-
-
Unit
MHz
mA
V/V
mA
dB
dB
dB
mA
ns
ns
ns
V
V
V
V
V
V
V