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부품번호 | MC34167 기능 |
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기능 | POWER SWITCHING REGULATORS | ||
제조업체 | Motorola Semiconductors | ||
로고 | |||
전체 16 페이지수
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
MC34167 MC33167
Figure 7. Switch Output Source Saturation
versus Source Current
0
VCC
– 0.5
TA = +25°C
–1.0
–1.5
– 2.0
– 2.5
– 3.0
0
2.0 4.0 6.0
ISource, SWITCH OUTPUT SOURCE CURRENT (A)
8.0
Figure 8. Negative Switch Output Voltage
versus Temperature
0
Gnd
– 0.2
VCC = 12 V
Pin 5 = 2.0 V
– 0.4 Pins 1, 3 = Gnd
Pin 2 Driven Negative
– 0.6
Isw = 100 µA
– 0.8 Isw = 10 mA
–1.0
–1.2
– 55
– 25
0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 9. Switch Output Current Limit
Threshold versus Temperature
7.2
VCC = 12 V
Pins 1, 2, 3 = Gnd
6.8
6.4
6.0
5.6
– 55 – 25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 10. Standby Supply Current
versus Supply Voltage
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. Undervoltage Lockout
Thresholds versus Temperature
6.5
Startup Threshold
6.0 VCC Increasing
5.5
Turn–Off Threshold
5.0 VCC Decreasing
4.5
4.0
– 55
– 25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
125
Figure 12. Operating Supply Current
versus Supply Voltage
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)
4 MOTOROLA ANALOG IC DEVICE DATA
4페이지 MC34167 MC33167
Thermal Protection
Internal Thermal Shutdown circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated, typically at 170°C,
the latch is forced into a ‘reset’ state, disabling the output
switch. This feature is provided to prevent catastrophic failures
from accidental device overheating. It is not intended to be
used as a substitute for proper heatsinking. The MC34167
is contained in a 5–lead TO–220 type package. The tab of the
package is common with the center pin (Pin 3) and is normally
connected to ground.
DESIGN CONSIDERATIONS
Do not attempt to construct a converter on wire–wrap
or plug–in prototype boards. Special care should be taken
to separate ground paths from signal currents and ground
paths from load currents. All high current loops should be
kept as short as possible using heavy copper runs to
minimize ringing and radiated EMI. For best operation, a tight
component layout is recommended. Capacitors Cin, CO, and
all feedback components should be placed as close to the IC
as physically possible. It is also imperative that the Schottky
diode connected to the Switch Output be located as close to
the IC as possible.
Figure 15. Low Power Standby Circuit
+
100 µA
Error
Amp
1
120
Compensation 5
R1
I = Standby Mode
Figure 16. Over Voltage Shutdown Circuit
+
100 µA
Error
Amp
1
120
Compensation 5
R1
VShutdown = VZener + 0.7
Figure 17. Soft–Start Circuit
+
100 µA
Error
Amp
120
Compensation 5
D2
Vin
D1
1.0 M
Css
tSoft–Start ≈ 35,000 Css
1
R1
MOTOROLA ANALOG IC DEVICE DATA
7
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |