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PDF MC33166 Data sheet ( Hoja de datos )
| Número de pieza | MC33166 | |
| Descripción | POWER SWITCHING REGULATORS | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Order this document by MC34166/D
Power Switching Regulators
MC34166
MC33166
The MC34166, MC33166 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 3.0 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
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
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/3.0 A
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
1 (D2PAK)
5
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
ORDERING INFORMATION
Operating
Device Temperature Range Package
MC33166D2T
Surface Mount
MC33166T TA = – 40° to + 85°C Straight Lead
MC33166TH
Horiz. Mount
MC33166TV
Vertical Mount
MC34166D2T
Surface Mount
MC34166T
MC34166TH
TA = 0° to + 70°C Straight Lead
Horiz. Mount
MC34166TV
Vertical Mount
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 4
1
1 page  
MC34166 MC33166
+
CT
Figure 13. MC34166 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
MC34166 MC33166
Figure 24. Triple Output Converter
Vin
24 V
ILIMIT
S
Q
R
UVLO
4
+
1000
2 1N5822
Reference
+
EA
+
1
T1
6.8 k
+
1000
MUR110
+
VO3
1000 –12 V/100 mA
MUR110
+1000
VO2
12 V/300 mA
VO1
5.05 V/2.0 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 = 2.0 A, IO2 = 300 mA, IO3 = 100 mA
4.0 mV = ± 0.04%
450 mV = ±1.9%
350 mV = ±1.5%
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 = 500 mA to 2.0 A, IO2 = 300 mA, IO3 = 100 mA
Vin = 24 V, IO1 = 2.0 A, IO2 = 100 mA to 300 mA, IO3 = 100 mA
Vin = 24 V, IO1 = 2.0 A, IO2 = 300 mA, IO3 = 30 mA to 100 mA
Vin = 24 V, IO1 = 2.0 A, IO2 = 300 mA, IO3 = 100 mA
Vin = 24 V, RL = 0.1 Ω
2.0 mV = ± 0.02%
420 mV = ±1.7%
310 mV = ±1.3%
50 mVpp
25 mVpp
10 mVpp
4.3 A
1.83 A
1.47 A
Efficiency
TOTAL Vin = 24 V, IO1 = 2.0 A, IO2 = 300 mA, IO3 = 100 mA
83.3%
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 — 65 turns of #26 AWG
T1 = Secondary: VO3 — 96 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 MC33166.PDF ] | |
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