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MC33166 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer MC33166
Beschreibung (MC33166 / MC34166) Step-Up/Down/Inverting Switching Regulators
Hersteller ON Semiconductor
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Gesamt 18 Seiten
MC33166 Datasheet, Funktion
www.DataSheet4U.com
MC34166, MC33166
3.0 A, Step−Up/Down/
Inverting Switching
Regulators
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 mA.
Features
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 mA
Economical 5−Lead TO−220 Package with Two Optional Leadforms
Also Available in Surface Mount D2PAK Package
Moisture Sensitivity Level (MSL) Equals 1
Pb−Free Packages are Available
Vin
ILIMIT
4
Oscillator
PWM
S
Q
R
2
Thermal
UVLO
Reference
L
EA
1
VO
5.05 V/
3.0 A
35
This device contains 143 active transistors.
Figure 1. Simplified Block Diagram
(Step Down Application)
http://onsemi.com
x = 3 or 4
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb−Free Package
MARKING
DIAGRAMS
1
5
TO−220
TH SUFFIX
CASE 314A
MC
3x166T
AWLYWWG
1
5
TO−220
TV SUFFIX
CASE 314B
MC
3x166T
AWLYWWG
Heatsink surface connected to Pin 3
TO−220
MC
T SUFFIX
3x166T
CASE 314D AWLYWWG
1
5
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
1
5
D2PAK
D2T SUFFIX
CASE 936A
MC
3x166T
AWLYWWG
Heatsink surface (shown as
terminal 6 in case outline
1
drawing) is connected to Pin 3
5
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2005
October, 2005 − Rev. 7
1
Publication Order Number:
MC34166/D






MC33166 Datasheet, Funktion
+
CT
Oscillator
Pulse Width
Modulator
MC34166, MC33166
Current
Sense
S
Q
R
PWM Latch
Undervoltage
Lockout
Vin
4
Input Voltage/VCC
Cin
Switch
Output
2
Thermal
Shutdown
+
100 mA
5.05 V
Reference
Error
Amp
120
+ Voltage
Feedback
Input
1 R2
GND 3
Compensation 5 CF
RF
=
Sink Only
Positive True Logic
R1
Figure 14. MC34166 Representative Block Diagram
L
VO
CO
4.1 V
Timing Capacitor CT
Compensation
2.3 V
ON
Switch Output
OFF
Figure 15. Timing Diagram
http://onsemi.com
6

6 Page









MC33166 pdf, datenblatt
+
Oscillator
PWM
Thermal
3
MC34166, MC33166
ILIMIT
S
Q
R
UVLO
Reference
+
EA
Vin
24 V
4
+
1000
2
+
1
1N5822
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
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
5.0 V
12 V
−12 V
5.0 V
12 V
−12 V
5.0 V
12 V
−12 V
5.0 V
12 V
−12 V
TOTAL
Conditions
Vin = 15 V to 30 V, IO1 = 2.0 A, IO2 = 300 mA, IO3 = 100 mA
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 W
Vin = 24 V, IO1 = 2.0 A, IO2 = 300 mA, IO3 = 100 mA
Results
4.0 mV = ± 0.04%
450 mV = ±1.9%
350 mV = ±1.5%
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
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.
Figure 25. Triple Output Converter
http://onsemi.com
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