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PDF MC33167 Data sheet ( Hoja de datos )
| Número de pieza | MC33167 | |
| Descripción | POWER SWITCHING REGULATORS | |
| Fabricantes | Motorola Semiconductors | |
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Order this document by MC34167/D
Power Switching Regulators
MC34167
MC33167
The MC34167, MC33167 series are high performance fixed frequency
power switching regulators that contain the primary functions required for
dc–to–dc converters. This series was specifically designed to be
incorporated in step–down and voltage–inverting configurations with a
minimum number of external components and can also be used cost
effectively in step–up applications.
These devices consist of an internal temperature compensated
reference, fixed frequency oscillator with on–chip timing components,
latching pulse width modulator for single pulse metering, high gain error
amplifier, and a high current output switch.
Protective features consist of cycle–by–cycle current limiting,
undervoltage lockout, and thermal shutdown. Also included is a low power
standby mode that reduces power supply current to 36 µA.
• Output Switch Current in Excess of 5.0 A
• Fixed Frequency Oscillator (72 kHz) with On–Chip Timing
• Provides 5.05 V Output without External Resistor Divider
• Precision 2% Reference
• 0% to 95% Output Duty Cycle
• Cycle–by–Cycle Current Limiting
• Undervoltage Lockout with Hysteresis
• Internal Thermal Shutdown
• Operation from 7.5 V to 40 V
• Standby Mode Reduces Power Supply Current to 36 µA
• Economical 5–Lead TO–220 Package with Two Optional Leadforms
• Also Available in Surface Mount D2PAK Package
Simplified Block Diagram
(Step Down Application)
ILIMIT
Vin
4
Oscillator
PWM
Thermal
S
Q
R
UVLO
Reference
2
EA
1
35
This device contains 143 active transistors.
L
VO
5.05 V/5.0 A
POWER SWITCHING
REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
TH SUFFIX
PLASTIC PACKAGE
CASE 314A
1
5
1
5
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
Heatsink surface connected to Pin 3.
T SUFFIX
PLASTIC PACKAGE
CASE 314D
1
5
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
1
5
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
ORDERING INFORMATION
Operating
Device Temperature Range Package
MC33167D2T
Surface Mount
MC33167T
Straight Lead
MC33167TH TA = – 40° to +85°C Horiz. Mount
MC33167TV
Vertical Mount
MC34167D2T
Surface Mount
MC34167T
Straight Lead
MC34167TH TA = 0° to + 70°C Horiz. Mount
MC34167TV
Vertical Mount
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 3
1
1 page  
MC34167 MC33167
+
CT
Figure 13. MC34167 Representative Block Diagram
Vin
Oscillator
Pulse Width
Modulator
Current
Sense
S
Q
R
PWM Latch
Undervoltage
Lockout
4
Input Voltage/VCC
Cin
Switch
Output
2
Thermal
Shutdown
+
100 µA
5.05 V
Reference
Error
Amp
120
+ Voltage
Feedback
Input
1 R2
Gnd 3
Compensation 5 CF
RF
=
Sink Only
Positive True Logic
R1
L
VO
CO
4.1 V
Timing Capacitor CT
Compensation
2.3 V
ON
Switch Output
OFF
Figure 14. Timing Diagram
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
+
Oscillator
PWM
Thermal
3
MC34167 MC33167
Figure 24. Triple Output Converter
Vin
24 V
ILIMIT
S
Q
R
UVLO
4
+
1000
2 1N5825
Reference
+
EA
+
1
T1
6.8 k
+
1000
MUR110
+
VO3
1000 –12 V/200 mA
MUR110
+1000
VO2
12 V/250 mA
VO1
5.0 V/3.0 A
5
0.1 68 k
Tests
Conditions
Results
Line Regulation
5.0 V
12 V
–12 V
Vin = 15 V to 30 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 200 mA
3.0 mV = ± 0.029%
572 mV = ± 2.4%
711 mV = ± 2.9%
Load Regulation
Output Ripple
Short Circuit Current
5.0 V
12 V
–12 V
5.0 V
12 V
–12 V
5.0 V
12 V
–12 V
Vin = 24 V, IO1 = 30 mA to 3.0 A, IO2 = 250 mA, IO3 = 200 mA
Vin = 24 V, IO1 = 3.0 A, IO2 = 100 mA to 250 mA, IO3 = 200 mA
Vin = 24 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 75 mA to 200 mA
Vin = 24 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 200 mA
Vin = 24 V, RL = 0.1 Ω
1.0 mV = ± 0.009%
409 mV = ±1.5%
528 mV = ± 2.0%
75 mVpp
20 mVpp
20 mVpp
6.5 A
2.7 A
2.2 A
Efficiency
TOTAL
Vin = 24 V, IO1 = 3.0 A, IO2 = 250 mA, IO3 = 200 mA
84.2%
T1 = Primary: Coilcraft M1496–A or General Magnetics Technology GMT–0223, 42 turns of #16 AWG on Magnetics Inc. 58350–A2 core.
T1 = Secondary: VO2 – 69 turns of #26 AWG
T1 = Secondary: VO3 – 104 turns of #28 AWG
Heatsink = AAVID Engineering Inc. 5903B, or 5930B.
Multiple auxiliary outputs can easily be derived by winding secondaries on the main output inductor to form a transformer. The secondaries must be connected so
that the energy is delivered to the auxiliary outputs when the Switch Output turns off. During the OFF time, the voltage across the primary winding is regulated by
the feedback loop, yielding a constant Volts/Turn ratio. The number of turns for any given secondary voltage can be calculated by the following equation:
+ ǒ )) Ǔ# TURNS(SEC)
VO(SEC) VF(SEC)
VO(PRI) VF(PRI)
#TURNS(PRI)
Note that the 12 V winding is stacked on top of the 5.0 V output. This reduces the number of secondary turns and improves lead regulation. For best auxiliary
regulation, the auxiliary outputs should be less than 33% of the total output power.
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MC33167.PDF ] | |
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