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PDF MC33129 Data sheet ( Hoja de datos )
| Número de pieza | MC33129 | |
| Descripción | HIGH PERFORMANCE CURRENT MODE CONTROLLERS | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Order this document by MC34129/D
High Performance
Current Mode Controllers
The MC34129/MC33129 are high performance current mode switching
regulators specifically designed for use in low power digital telephone
applications. These integrated circuits feature a unique internal fault timer
that provides automatic restart for overload recovery. For enhanced system
efficiency, a start/run comparator is included to implement bootstrapped
operation of VCC. Other functions contained are a temperature compensated
reference, reference amplifier, fully accessible error amplifier, sawtooth
oscillator with sync input, pulse width modulator comparator, and a high
current totem pole driver ideally suited for driving a power MOSFET.
Also included are protective features consisting of soft–start,
undervoltage lockout, cycle–by–cycle current limiting, adjustable deadtime,
and a latch for single pulse metering.
Although these devices are primarily intended for use in digital telephone
systems, they can be used cost effectively in many other applications.
• Current Mode Operation to 300 kHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle–by–Cycle Current Limiting
• Continuous Retry after Fault Timeout
• Soft–Start with Maximum Peak Switch Current Clamp
• Internally Trimmed 2% Bandgap Reference
• High Current Totem Pole Driver
• Input Undervoltage Lockout
• Low Startup and Operating Current
• Direct Interface with Motorola SENSEFET Products
MC34129
MC33129
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
14
1
P SUFFIX
PLASTIC PACKAGE
CASE 646
14
1
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
PIN CONNECTIONS
CSoft–Start 12
7
Gnd
6
Vref 2.5V
5
RT/CT
Sync/Inhibit 4
Input
Simplified Block Diagram
Soft–Start
and
Fault Timer
Start/Run
13 Start/Run
Output
Undervoltage 14
Lockout
VCC
1.25V
Reference
8
Vref 1.25V
X2
Oscillator
Latching
PWM
Error Amp
9
+
–
10
Noninverting
Input
Inverting
11
Input
Feedback/
1 PWM Input
Drive Out
2
Drive Gnd
3
Ramp Input
Drive Output 1
Drive Ground 2
Ramp Input 3
Sync/Inhibit
Input
4
RT/CT 5
Vref 2.5 V 6
Gnd 7
14 VCC
13 Start/Run Output
12 CSoft–Start
Feedback/
11 PWM Input
10
Error Amp
Inverting Input
9 Error Amp
Noninverting Input
8 Vref 1.25 V
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC34129D
MC34129P
TA = 0° to +70°C
SO–14
Plastic DIP
MC33129D
TA = – 40° to +85°C
MC33129P
SO–14
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1
1 page  
MC34129 MC33129
Figure 7. Error Amp Open Loop DC Gain
versus Load Resistance
90
80
70
60 VCC = 10 V
VO = 1.25 V
RL to 1.25 Vref
TA = 25°C
50
0 20 40 60 80 100
RL, OUTPUT LOAD RESISTANCE (kΩ)
Figure 8. Error Amp Output Saturation
versus Sink Current
1.0
VCC = 10 V
Pins 8 to 9, 6 to 10
0.8 Pins 2, 5, 7 to Gnd
TA = 25°C
0.6
0.4
0.2
0
0 2.0 4.0 6.0 8.0
ISink, OUTPUT SINK CURRENT (mA)
Figure 9. Soft–Start Buffer Output Saturation
versus Sink Current
1.0
VCC = 10 V
0.8
Pins 8 to 9
Pins 2, 5, 7, 10, 12 to Gnd
TA = 25°C
0.6
0.4
0.2
0
0 100 200 300 400 500
ISink, OUTPUT SINK CURRENT (µA)
Figure 10. Reference Output Voltage versus
Supply Voltage
3.2
TA = 25°C
Vref 2.5 V, RL = 2.5 k
2.4
1.6 Vref 1.25 V, RL = ∞
0.8
0
0 4.0 8.0 12 16
VCC, SUPPLY VOLTAGE (V)
Figure 11. 1.25 V Reference Output Voltage
Change versus Source Current
0
VCC = 10 V
–4.0
–8.0
–12 +25°C
TA = – 40°C
+85°C
–16
–20
–24
0 2.0 4.0 6.0 8.0 10
Iref, REFERENCE OUTPUT SOURCE CURRENT (mA)
Figure 12. 2.5 V Reference Output Voltage
Change versus Source Current
0
VCC = 10 V
–4.0
–8.0
–12
TA = – 40°C
25°C 85°C
–16
–20
–24
0 0.4 0.8 1.2 1.6 2.0
Iref, REFERENCE OUTPUT SOURCE CURRENT (mA)
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC34129 MC33129
Figure 20. External Duty Cycle Clamp
and Multi–Unit Synchronization
6 2.5V
+
–
5.0V
RA 8
RB 5.0k
6
5
+
–
5.0k
2+
–
5.0k
C
1
f=
1.44
(RA + 2RB)C
4
R
Q
S
MC1455
3
7
Dmax =
RB
RA + 2RB
5
OSC
4
To Additional
MC34129’s
Figure 21. Bootstrap Startup
Vin
CSoft–Start
12
7
6 2.5V –+
5
OSC
4
+
–
–+
–+
R
Q
S
–+
1.25V
+
–
13
Q2
14
9.1 +
V
8
9
10
11
1
2
3
The external 9.1 V zener is required when driving low threshold MOSFETs.
Figure 22. Discrete Step Reduction of Clamp Level
+
275mV
+
–
Vin
1.25V
8
9
+
– 10
11
R
Q
S
Ipk(max) =
1.675 – (VF(D1) + VF(D2))
RS
Q1
1
2
3 D1 D2
≈ 120µA
RS
Figure 23. Adjustable Reduction of Clamp Level
+
275mV
+
–
1.25V
+
–
Vin
8
9
10
R2
11
R
Q
S
R1
Q1
1
2
3
RS
If:
1.25 V
R1 + R2
≥ 1.0 mA
Then: Ipk(max) ≈
1.25 – 0.275
R2
R1 + 1
RS
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MC33129.PDF ] | |
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