UC3845BVDR2 ON Semiconductor, UC3845BVDR2 Datasheet - Page 3
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UC3845BVDR2
Manufacturer Part Number
UC3845BVDR2
Description
IC CTRLR CURRENT MODE HP 14-SOIC
Manufacturer
ON Semiconductor
Datasheet
1.UC3844BDR2G.pdf
(19 pages)
Specifications of UC3845BVDR2
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
275kHz
Duty Cycle
50%
Voltage - Supply
8.2 V ~ 25 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
Yes
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 105°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
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UC3845BVDR2G
Manufacturer:
ON
Quantity:
12 000
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