MC34167

Manufacturer Part NumberMC34167
Description(MC33167 / MC34167) Step-Up/Down/Inverting Switching Regulators
ManufacturerON Semiconductor
MC34167 datasheet
 


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MC34167, MC33167
5.0 A, Step−Up/Down/
Inverting Switching
Regulators
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 mA.
Features
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 mA
Economical 5−Lead TO−220 Package with Two Optional Leadforms
Also Available in Surface Mount D
Moisture Sensitivity Level (MSL) Equals 1
Pb−Free Packages are Available
Oscillator
S
Q
R
PWM
UVLO
Thermal
3
5
This device contains 143 active transistors.
Figure 1. Simplified Block Diagram
(Step Down Application)
© Semiconductor Components Industries, LLC, 2005
November, 2005 − Rev. 7
2
PAK Package
V
in
4
I
LIMIT
2
L
Reference
EA
1
V
O
5.05 V/
5.0 A
1
http://onsemi.com
MARKING
DIAGRAMS
TO−220
TH SUFFIX
CASE 314A
1
5
AWLYWWG
Heatsink surface connected to Pin 3
TO−220
1
TV SUFFIX
CASE 314B
5
AWLYWWG
TO−220
T SUFFIX
1
CASE 314D
5
AWLYWWG
Pin
1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/V
CC
5. Compensation/Standby
2
D
PAK
D2T SUFFIX
1
CASE 936A
AWLYWWG
5
Heatsink surface (shown as
terminal 6 in case outline
1
drawing) is connected to Pin 3
x
= 3 or 4
A
= Assembly Location
WL = Wafer Lot
Y
= Year
WW = Work Week
G
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
Publication Order Number:
MC34167/D
MC
3x167T
MC
3x167T
MC
3x167T
MC
3x167T
5

MC34167 Summary of contents

  • Page 1

    ... MC34167, MC33167 5.0 A, Step−Up/Down/ Inverting Switching Regulators 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− ...

  • Page 2

    ... This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL−STD−883, Method 3015. Machine Model Method 200 0°C for MC34167 low = − 40°C for MC33167 MC34167, MC33167 70°C for MC34167 high = + 85°C for MC33167 http://onsemi.com 2 Symbol Value Unit V ...

  • Page 3

    ... V) DC Comp (min Source sat I sw(off) I pk(switch) = +25° th(UVLO) V H(UVLO 70°C for MC34167 high = + 85°C for MC33167 http://onsemi.com 3 is the operating ambient A Min Typ Max Unit kHz 62 − 81 4.95 5.05 5.15 4.85 − 5.20 − 0.03 0.078 %/V − ...

  • Page 4

    ... Figure 4. Error Amp Open Loop Gain and Phase versus Frequency 4.0 0 − 4.0 − 8.0 − 12 − 55 − AMBIENT TEMPERATURE (°C) A Figure 6. Oscillator Frequency Change versus Temperature MC34167, MC33167 100 100 125 − 55 − 25 Figure 3. Voltage Feedback Input Bias 2 ...

  • Page 5

    ... V Increasing CC 5.5 Turn−Off Threshold V Decreasing CC 5.0 4.5 4.0 − 55 − AMBIENT TEMPERATURE (°C) A Figure 12. Undervoltage Lockout Thresholds versus Temperature MC34167, MC33167 0 − 0 +25°C A Pin 5 = 2.0 V − 0.4 Pins GND Pin 2 Driven Negative − 0.6 − 0.8 −1.0 −1.2 6.0 8.0 − 55 − 25 Figure 9. Negative Switch Output Voltage ...

  • Page 6

    ... MC34167, MC33167 + Oscillator C T Pulse Width PWM Latch Modulator Thermal Shutdown 100 mA GND Compensation 3 = Figure 14. MC34167 Representative Block Diagram 4.1 V Timing Capacitor C T Compensation 2 Switch Output OFF Figure 15. Timing Diagram http://onsemi.com V in Current 4 Sense Input Voltage Switch Q Output R 2 Undervoltage Lockout 5 ...

  • Page 7

    ... The MC34167, MC33167 series are monolithic power switching regulators that are optimized for dc−to−dc converter applications. These devices operate as fixed frequency, voltage mode regulators containing all the active functions required to directly implement step−down and voltage−inverting converters with a minimum number of external components. They can also be used cost effectively in step− ...

  • Page 8

    ... This feature is provided to prevent catastrophic failures from accidental device overheating 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. ...

  • Page 9

    ... Error 100 mA Amp 120 Compensation Standby Mode Figure 16. Low Power Standby Circuit Compensation V in MC34167, MC33167 100 mA 1 Compensation Shutdown Figure 17. Over Voltage Shutdown Circuit + Error 100 mA Amp 1 120 1.0 M ≈ 35,000 C t Soft−Start ss Figure 18. Soft−Start Circuit http://onsemi ...

  • Page 10

    ... V by controlling the percent conduction time ref voltage greater than 5.05 V, resistor R must be added to form a divider network at the feedback input. 1 3.0″ (Bottom View) Figure 20. Step−Down Converter Printed Circuit Board and Component Layout MC34167, MC33167 ILIMIT UVLO ...

  • Page 11

    ... Magnetics Inc. 58350−A2 core. Heatsink = AAVID Engineering Inc. 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 Q to the output filter capacitor and load. This circuit configuration has two significant advantages over the basic step−up converter circuit. The first ...

  • Page 12

    ... Magnetics Inc. 58350−A2 core. Heatsink = AAVID Engineering Inc. 5903B, or 5930B. Two potential problems arise when designing the standard voltage−inverting converter with the MC34167. First, the Switch Output emitter is limited to −1.5 V with respect to the ground pin and second, the Error Amplifier’s noninverting input is internally committed to the reference and is not pinned out. Both of these problems are resolved by connecting the IC ground pin to the converter’ ...

  • Page 13

    ... 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. MC34167, MC33167 4 ILIMIT ...

  • Page 14

    ... MC34167, MC33167 + Oscillator S R PWM Thermal −12 V 1000 + *Gate resistor R , zener diode D G Test Line Regulation V = − − Load Regulation V = − Output Ripple V = − Efficiency V = − General Magnetics Technology GMT−0223, 42 turns of #16 AWG on Magnetics Inc. ...

  • Page 15

    ... Total Gap − 0.002, 1 The MC34167 can be used cost effectively in off−line applications even though it is limited to a maximum input voltage Figure 28 shows a simple and efficient method for converting the AC line voltage down This preconverter has a total power rating of 125 W with a conversion efficiency of 90%. Transformer T circuit self− ...

  • Page 16

    ... Desired peak−to−peak output ripple voltage. For best performance, the ripple voltage should be kept to less than ripple(pp) Capacitor C should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications. O MC34167, MC33167 Table 1. Design Equations Step−Up/Down V out ) satQ1 * V satQ2 ...

  • Page 17

    ... MC34167D2TR4G MC34167T MC34167TG MC34167TH MC34167THG MC34167TV MC34167TVG †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. MC34167, MC33167 Operating Temperature Range Package 2 D PAK (Surface Mount PAK (Surface Mount) (Pb− ...

  • Page 18

    ... −P− OPTIONAL Q CHAMFER 0.24 (0.610 0.10 (0.254 MC34167, MC33167 PACKAGE DIMENSIONS TO−220 TH SUFFIX CASE 314A−03 ISSUE E SEATING −T− PLANE TO−220 TV SUFFIX CASE 314B−05 ISSUE L NOTES ...

  • Page 19

    ... DETAIL A− 0.356 (0.014 MC34167, MC33167 TO−220 T SUFFIX CASE 314D−04 ISSUE F SEATING NOTES: −T− PLANE 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982 CONTROLLING DIMENSION: INCH DIMENSION D DOES NOT INCLUDE INTERCONNECT BAR (DAMBAR) PROTRUSION ...

  • Page 20

    ... Literature Distribution Center for ON Semiconductor P.O. Box 61312, Phoenix, Arizona 85082−1312 USA Phone: 480−829−7710 or 800−344−3860 Toll Free USA/Canada Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com MC34167, MC33167 2 D PAK D2T SUFFIX CASE 936A−02 ISSUE C − ...