UC3844BNG ON Semiconductor, UC3844BNG Datasheet - Page 11
![IC CTLR CURRENT MODE 8-DIP](/photos/6/58/65804/8-dip_626-05_sml.jpg)
UC3844BNG
Manufacturer Part Number
UC3844BNG
Description
IC CTLR CURRENT MODE 8-DIP
Manufacturer
ON Semiconductor
Type
Pulse Width Modulator Controllerr
Specifications of UC3844BNG
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
8-DIP (0.300", 7.62mm)
Frequency-max
275kHz
Number Of Pwm Outputs
1
On/off Pin
No
Adjustable Output
No
Topology
Boost/Flyback
Switching Freq
500KHz
Operating Supply Voltage (max)
30V
Output Current
1000A
Synchronous Pin
No
Rise Time
50ns
Fall Time
50ns
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
8
Package Type
PDIP
Duty Cycle (max)
48 % (Typ)
Output Voltage
4.9 V to 5.1 V
Mounting Style
Through Hole
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
70 C
Minimum Operating Temperature
0 C
Current, Input Bias
-2 μA
Current, Output
+12 mA (Sink), -1 mA (Source)
Current, Supply
30 mA
Frequency, Oscillator
250 kHz
Power Dissipation
1.25 W
Regulation, Line
2 mV
Regulation, Load
3 mV
Regulator Type
DC-DC
Temperature, Operating, Range
0 to +70 °C
Time, Fall
50 ns
Time, Rise
50 ns
Voltage, Gain
3 V/V
Voltage, Input
-0.3 to +5.5 V
Voltage, Noise
50 μV
Voltage, Output
5 V
Voltage, Output, High
13.5 V
Voltage, Output, Low
1.6 V
Voltage, Supply
36 V
Voltage, Supply, Rejection Ratio
70 dB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
UC3844BNGOS
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UC3844BNG
Manufacturer:
ON/安森美
Quantity:
20 000
Figure 25. MOSFET Parasitic Oscillations
Series gate resistor R
parasitic oscillations caused by the MOSFET input
capacitance and any series wiring inductance in the
gate-source circuit.
+
-
5.0V Ref
Comp/Latch
S
R
T
Q
-
+
g
will damp any high frequency
5.0V Ref
+
-
7(12)
Comp/Latch
Figure 24. Current Waveform Spike Suppression
V
CC
R
S
7(11)
6(10)
5(8)
3(5)
T
Q
R
g
+
-
7(12)
Q1
R
V
V
in
S
CC
7(11)
6(10)
5(8)
3(5)
http://onsemi.com
C
R
11
Q1
R
V
S
in
The addition of the RC filter will eliminate
instability caused by the leading edge spike
on the current waveform.
+
0
-
The totem pole output can furnish negative base current
for enhanced transistor turn-off, with the addition of
capacitor C
Figure 26. Bipolar Transistor Drive
I
B
1
.
Base Charge
Removal
6(10)
5(8)
3(5)
C1
Q1
V
R
in
S