UC3844BDG ON Semiconductor, UC3844BDG Datasheet - Page 3

• Manufacturer Part Number: UC3844BDG
• Description: IC CTRLR CURRENT MODE HP 14-SOIC
• Manufacturer: ON Semiconductor

Specifications of UC3844BDG

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 275kHz
• Duty Cycle: 50%
• Voltage - Supply: 11.5 V ~ 25 V
• Buck: No
• Boost: Yes
• Flyback: Yes
• Inverting: Yes
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Frequency-max: 275kHz
• Duty Cycle (max): 48 %
• Output Current: 1000 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 500 KHz
• Maximum Operating Temperature: + 70 C
• Fall Time: 50 ns
• Minimum Operating Temperature: 0 C
• Rise Time: 50 ns
• Synchronous Pin: No
• Topology: Boost, Flyback
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7. Adjust V
8. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
9. This parameter is measured at the latch trip point with V
10. Comparator gain is defined as: A
ELECTRICAL CHARACTERISTICS
T
OSCILLATOR SECTION
ERROR AMPLIFIER SECTION
CURRENT SENSE SECTION
OUTPUT SECTION
UNDERVOLTAGE LOCKOUT SECTION
A
Discharge Current (V
Voltage Feedback Input (V
Input Bias Current (V
Open Loop Voltage Gain (V
Unity Gain Bandwidth (T
Power Supply Rejection Ratio (V
Output Current − Sink (V
Output Current −
Output Voltage Swing
Current Sense Input Voltage Gain (Notes 9 & 10)
Maximum Current Sense Input Threshold (Note 9)
Power Supply Rejection Ratio (V
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 8], unless otherwise noted.)
T
T
T
High State (R
Low State (R
(UC284XB, UC384XB)
(UC384XBV)
(UC284XB, UC384XB)
(UC384XBV)
Low State (I
High State (I
UCX844B, BV
UCX845B, BV
UCX844B, BV
UCX845B, BV
low
A
A
J
(UC284XB, UC384XB)
(UC384XBV)
= 25°C
= T
= T
= 0°C for UC3844B, UC3845B
= − 25°C for UC2844B, UC2845B
= − 40°C for UC3844BV, UC3845BV
low
low
CC
to T
to T
above the Startup threshold before setting to 15 V.
(I
(I
(I
(I
L
L
high
high
Sink
Sink
Sink
Source
Source
Source
= 15 k to V
Source (V
= 15 k to ground, V
= 20 mA)
= 200 mA, UC284XB, UC384XB)
= 200 mA, UC384XBV)
(UC284XB, UC384XB)
(UC384XBV)
FB
OSC
= 20 mA, UC284XB, UC384XB)
= 20 mA, UC384XBV)
= 200 mA)
= 5.0 V)
Characteristic
J
O
= 2.0 V)
= 25°C)
O
= 1.1 V, V
O
O
ref
L
= 2.5 V)
L
= 5.0 V, V
= 1.0 nF, T
= 2.0 V to 4.0 V)
, V
= 1.0 nF, T
CC
FB
CC
V
= 2.7 V)
= DV Output/Compensation
= 12 V to 25 V)
= 12 V to 25 V) (Note 9)
FB
FB
CC
DV Current Sense Input
FB
= 2.7 V)
= 2.3 V)
J
J
(V
= 6.0 V, I
= 25°C)
= 2.3 V)
= 25°C)
CC
= 15 V [Note 7], 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
I
Source
CC(min)
A
dischg
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
7.8
7.5
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
8.3
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
8.8
8.8
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
7.8
7.6
7.2
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
8.3
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
8.8
8.8
8.8
1.1
1.2
1.1
1.1
0.4
2.2
2.3
1.1
9.0
8.2
−
−
−
−
−
−
−
−
−
−
Unit
MHz
mA
mA
V/V
mA
dB
dB
dB
mA
ns
ns
ns
V
V
V
V
V
V
V