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PDF NCV3843BV Data sheet ( Hoja de datos )
| Número de pieza | NCV3843BV | |
| Descripción | High Performance Current Mode Controllers | |
| Fabricantes | ON Semiconductor | |
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NCV3843BV
High Performance
Current Mode Controllers
The NCV3843BV is a high performance fixed frequency current
mode controller. They are specifically designed for Off−Line and
DC−DC converter applications offering the designer a cost−effective
solution with minimal external components. These integrated circuits
feature a trimmed oscillator for precise duty cycle control, a
temperature compensated reference, high gain error amplifier, current
sensing comparator, and a high current totem pole output ideally
suited for driving a power MOSFET.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle−by−cycle
current limiting, programmable output deadtime, and a latch for single
pulse metering.
These devices are available in a surface mount (SOIC−8) plastic
package as well as the 14−pin plastic surface mount (SOIC−14). The
SOIC−14 package has separate power and ground pins for the totem
pole output stage.
The NCV3843BV is tailored for lower voltage applications having
UVLO thresholds of 8.5 V (on) and 7.6 V (off).
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14
1
8
1
SOIC−14
D SUFFIX
CASE 751A
SOIC−8
D1 SUFFIX
CASE 751
PIN CONNECTIONS
Features
• Trimmed Oscillator for Precise Frequency Control
• Oscillator Frequency Guaranteed at 250 kHz
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle−By−Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
• These are Pb−Free Devices
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
8 Vref
7 VCC
6 Output
5 GND
(Top View)
Compensation 1
NC 2
Voltage Feedback 3
NC 4
Current Sense 5
NC 6
RT/CT 7
14 Vref
13 NC
12 VCC
11 VC
10 Output
9 GND
8 Power Ground
VCC 7(12)
(Top View)
Vref
8(14)
R
5.0V
Reference
VCC
Undervoltage
Lockout
R
Vref
Undervoltage
Lockout
VC
7(11)
RT/CT
Oscillator
Output
4(7)
Voltage
Feedback
+
Latching
PWM
6(10)
Power
Ground
Input -
5(8)
2(3) Error
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1(1)
GND 5(9)
Current
Sense
3(5) Input
Pin numbers in parenthesis are for the D suffix SOIC−14 package.
Figure 1. Simplified Block Diagram
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 15 of this data sheet.
© Semiconductor Components Industries, LLC, 2008
September, 2008 − Rev. 0
1
Publication Order Number:
NCV3843BV/D
1 page  
NCV3843BV
80
50
20
8.0
5.0
2.0 VCC = 15 V
TA = 25°C
0.8
10 k
20 k
50 k 100 k 200 k
500 k 1.0 M
fOSC, OSCILLATOR FREQUENCY (kHz)
ǒ Ǔ ǒ ǓFreq +
Ct
Vosc
IRt
1
)
Ct
Vosc
Idis*IRt
Where: Vosc = 1.7 V
IRt = Vref/Rt
Idis = 8.3 mA
Figure 2. Timing Resistor
versus Oscillator Frequency
100
1. CT = 10 nF
50 2. CT = 5.0 nF
3. CT = 2.0 nF
4. CT = 1.0 nF
20 5. CT = 500 pF
6. CT = 200 pF
10 7. CT = 100 pF
5.0
4
3
2
1
7
6
5
2.0
1.0
10 k
VCC = 15 V
TA = 25°C
20 k
50 k 100 k 200 k
500 k
fOSC, OSCILLATOR FREQUENCY (kHz)
1.0 M
Figure 3. Output Deadtime
versus Oscillator Frequency
9.0
VCC = 15 V
VOSC = 2.0 V
8.5
8.0
7.5
7.0
- 55
- 25 0
25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
Figure 4. Oscillator Discharge Current
versus Temperature
125
100
90
80 Idischg = 7.5 mA
70
60
Idischg = 8.8 mA
VCC = 15 V
CT = 3.3 nF
50 TA = 25°C
40
0.8 1.0
2.0 3.0 4.0 5.0 6.0 7.0 8.0
RT, TIMING RESISTOR (kW)
Figure 5. Maximum Output Duty Cycle
versus Timing Resistor
2.55 V
2.50 V
VCC = 15 V
AV = -1.0
TA = 25°C
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0.5 ms/DIV
Figure 6. Error Amp Small Signal
Transient Response
3.0 V
2.5 V
VCC = 15 V
AV = -1.0
TA = 25°C
2.0 V
1.0 ms/DIV
Figure 7. Error Amp Large Signal
Transient Response
http://onsemi.com
5
5 Page 
NCV3843BV
(A)
DI
Control Voltage
Inductor
Current
m1 m2
Dl
)
Dl
m2
m1
Oscillator Period
Dl
)
Dl
mm21
m2
m1
t0 t1 t2
Control Voltage
(B)
m3
DI
m1
m2
Oscillator Period
t3
Inductor
Current
t4 t5 t6
Figure 20. Continuous Current Waveforms
Vref
8(14)
RT
R
Bias
R
External
Sync
Input
CT
0.01
47
4(7)
2(3)
Osc
+
EA
2R
R
1(1)
5(9)
The diode clamp is required if the Sync amplitude is large enough to cause the bottom
side of CT to go more than 300 mV below ground.
Figure 21. External Clock Synchronization
VCC
7(12)
Vin
RA
8
RB
6
5.0k
5 5.0k
2
C 5.0k
1
4
R
Q
S
MC1455
8(14)
3
4(7)
7
2(3)
1(1)
R
Bias
R
Osc
+
EA
2R
R
8(14)
4(7)
R2
2(3)
1(1)
R1
R
Bias
R
5.0V Ref
+
-
Osc
+
1.0 mA
VClamp
EA
2R
R
1.0V
S
Q
R
Comp/Latch
5(9)
+
-
7(11)
6(10)
5(8)
3(5)
f
+
(RA
1.44
) 2RB)C
D(max)
+
RA
RB
)
2RB
To Additional
UCX84XBs
ǒ Ǔ ǒ Ǔ5(9)
VClamp ≈
1.67
R2
R1
)
1
+ 0.33x10-3
R1R2
R1 ) R2
Where: 0 ≤ VClamp ≤ 1.0 V
Ipk(max)
[
VClamp
RS
Q1
RS
Figure 22. External Duty Cycle Clamp and
Multi−Unit Synchronization
Figure 23. Adjustable Reduction of Clamp Level
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11
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet NCV3843BV.PDF ] | |
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