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PDF 33167T Data sheet ( Hoja de datos )
| Número de pieza | 33167T | |
| Descripción | MC33167T | |
| Fabricantes | ON Semiconductor | |
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MC34167, MC33167
5.0 A, Step-Up/Down/
Inverting Switching
Regulators
w w w . d Tahtea Ms hC3e4e16t 74, uM. Cc 3o31m67 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
• Moisture Sensitivity Level (MSL) Equals 1
Vin
ILIMIT
4
Oscillator
PWM
S
Q
R
2
Thermal
UVLO
Reference
L
EA
1
VO
5.05 V/
5.0 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
MARKING
DIAGRAMS
1
5
TO–220
TH SUFFIX
CASE 314A
MC
3x167T
AWLYWW
1
5
TO–220
TV SUFFIX
CASE 314B
MC
3x167T
AWLYWW
Heatsink surface connected to Pin 3
TO–220
MC
T SUFFIX
3x167T
CASE 314D AWLYWW
1
5
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
D2PAK
D2T SUFFIX
1 CASE 936A
5
Heatsink surface (shown as
terminal 6 in case outline
drawing) is connected to Pin 3
MC
3x167T
AWLYWW
15
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
© Semiconductor Components Industries, LLC, 2002
January, 2002 – Rev. 5
1
Publication Order Number:
MC34167/D
1 page  
MC34167, MC33167
0
VCC
-Ă0.5
TA = +25°C
-1.0
-1.5
www.datash-eĂ2e.0t4u.com
-Ă2.5
-Ă3.0
0
2.0 4.0 6.0
ISource, SWITCH OUTPUT SOURCE CURRENT (A)
Figure 8. Switch Output Source Saturation
versus Source Current
8.0
0
-Ă0.2 VCC = 12 V
Pin 5 = 2.0 V
-Ă0.4 Pins 1, 3 = Gnd
Pin 2 Driven Negative
-Ă0.6
Gnd
Isw = 100 µA
-Ă0.8 Isw = 10 mA
-1.0
-1.2
-Ă55
-Ă25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
Figure 9. Negative Switch Output Voltage
versus Temperature
125
7.2
VCC = 12 V
Pins 1, 2, 3 = Gnd
6.8
6.4
6.0
5.6
-Ă55 -Ă25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 10. Switch Output Current Limit
Threshold versus Temperature
160
Pin 4 = VCC
Pins 1, 3, 5 = Gnd
Pin 2 Open
120 TA = +25°C
80
40
0
0
10 20
30 40
VCC, SUPPLY VOLTAGE (V)
Figure 11. Standby Supply Current
versus Supply Voltage
6.5
Startup Threshold
6.0 VCC Increasing
5.5
Turn-Off Threshold
5.0 VCC Decreasing
4.5
4.0
-Ă55
-Ă25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
125
Figure 12. Undervoltage Lockout
Thresholds versus Temperature
50
40
30
20 Pin 4 = VCC
Pins 1, 3 = Gnd
10
Pins 2, 5 Open
TA = +25°C
0
0 10 20 30 40
VCC, SUPPLY VOLTAGE (V)
Figure 13. Operating Supply Current
versus Supply Voltage
http://onsemi.com
5
5 Page 
MC34167, MC33167
Vin
12 V
+
Oscillator
www.datasheet4u.com
PWM
ILIMIT
S
Q
R
UVLO
4
+
Cin
330
Q1
D1
1N5825
2
Thermal
Reference
+
EA
D4
1N4148
+
1
D3
1N967A
R2
6.8 k
3 5 CF RF
0.47 4.7 k
*Gate resistor RG, zener diode D3, and diode D4 are required only when Vin is greater than 20 V.
R1
1.5 k
L
190 µH
*RG
620
Q2
MTP3055EL
D2
1N5822
CO +
2200
VO
28 V/0.9 A
Test
Conditions
Results
Line Regulation
Vin = 10 V to 24 V, IO = 0.9 A
10 mV = ± 0.017%
Load Regulation
Vin = 12 V, IO = 0.1 A to 0.9 A
30 mV = ± 0.053%
Output Ripple
Vin = 12 V, IO = 0.9 A
140 mVpp
Short Circuit Current
Vin = 12 V, RL = 0.1 Ω
6.0 A
Efficiency
Vin = 12 V, IO = 0.9 A
Vin = 24 V, IO = 0.9 A
80.1%
87.8%
L = Coilcraft M1496–A or General Magnetics Technology GMT–0223, 42 turns of #16 AWG on
Magnetics Inc. 58350–A2 core.
Heatsink = AAVID Engineering Inc. MC34167: 5903B, or 5930B MTP3055EL: 5925B
Figure 21 shows that the MC34167 can be configured as a step–up/down converter with the addition of an external power MOSFET. Energy
is stored in the inductor during the ON time of transistors Q1 and Q2. During the OFF time, the energy is transferred, with respect to ground,
to the output filter capacitor and load. This circuit configuration has two significant advantages over the basic step–up converter circuit. The first
advantage is that output short circuit protection is provided by the MC34167, since Q1 is directly in series with Vin and the load. Second, the
output voltage can be programmed to be less than Vin. Notice that during the OFF time, the inductor forward biases diodes D1 and D2, transferring
its energy with respect to ground rather than with respect to Vin. When operating with Vin greater than 20 V, a gate protection network is required
for the MOSFET. The network consists of components RG, D3, and D4.
Figure 21. Step–Up/Down Converter
3.45
″
(Bottom View)
VO
-+
+ Vin -
+
ÎÎÎÎÎÎÎÎÎÎRFÎÎÎÎÎR1ÎÎÎÎÎCFÎÎÎÎÎ
+
(Top View)
D3
D2 ÎÎÎÎÎRG ÎÎÎ
Figure 22. Step–Up/Down Converter Printed Circuit Board and Component Layout
http://onsemi.com
11
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| PDF Descargar | [ Datasheet 33167T.PDF ] | |
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