MC34023 ON Semiconductor, MC34023 Datasheet
MC34023
Available stocks
Related parts for MC34023
MC34023 Summary of contents
Page 1
... MC34023, MC33023 High Speed Single−Ended PWM Controller The MC34023 series are high speed, fixed frequency, single−ended pulse width modulator controllers optimized for high frequency operation. They are specifically designed for Off−Line and DC−to−DC converter applications offering the designer a cost− ...
Page 2
... Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. MC34023, MC33023 Package SOIC−16W SOIC− ...
Page 3
... Soft−Start Discharge Current (V = 1.5 V) Soft−Start 1. Maximum package power dissipation limits must be observed. 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible 0°C for MC34023 low = −40°C for MC33023 MC34023, MC33023 ( 3.65 kW ...
Page 4
... Decreasing After Turn−On) CC TOTAL DEVICE Power Supply Current Startup (VCC = 8.0 V) Operating 3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible 0°C for MC34023 low = −40°C for MC33023 MC34023, MC33023 ( 3.65 kW 1.0 nF, for typical values T ...
Page 5
... Phase − 100 1 FREQUENCY (Hz) Figure 4. Error Amp Open Loop Gain and Phase versus Frequency 2.55 V 2.5 V 2.45 V 0.1 ms/DIV Figure 6. Error Amp Small Signal Transient Response MC34023, MC33023 1200 25°C A 1000 800 V CC 600 400 200 ...
Page 6
... Pin 11(14 − 20 − 60 − 100 − 55 − AMBIENT TEMPERATURE (°C) A Figure 12. Current Limit Comparator Input Offset Voltage versus Temperature MC34023, MC33023 65.6 65 25°C A 64.8 64 − 55 − 25 Figure 9. Reference Short Circuit Current Figure 11. Reference Load Regulation 1 ...
Page 7
... Figure 14. Soft−Start Charge Current versus Temperature OUTPUT RISE & FALL TIME 1.0 nF LOAD 50 ns/DIV Figure 16. Drive Output Rise and Fall Time 5 Figure 18. Supply Voltage versus Supply Current MC34023, MC33023 0 − 1 Pulsed Load 120 Hz Rate − 2 25°C A 2.0 1.0 ...
Page 8
... Error 2 Amp Noninverting Input Inverting Input 1 8 Soft−Start Clock Soft−Start Error Amp Output Ramp PWM Comparator Output Figure 20. Current Limit Operating Waveforms MC34023, MC33023 Reference Regulator V CC UVLO 9 4.2 V ref UVLO R PWM Q Comparator S PWM Latch + 9 Soft−Start Latch ...
Page 9
... The MC33023 and MC34023 series are high speed, fixed frequency, single−ended pulse width modulator controllers optimized for high frequency operation. They are specifically designed for Off−Line and DC−to−DC converter applications offering the designer a cost effective solution with minimal external representative block diagram is shown in Figure 19 ...
Page 10
... IC to have an off−line bootstrap startup circuit. Typical startup current is 500 mA. Output The MC34023 has a high current totem pole output specifically designed for direct drive of power MOSFETs capable ± 2.0 A peak drive current with a typical rise and fall time driving a 1.0 nF load. ...
Page 11
... V ref In voltage mode operation, the control range on the output of the Error Amplifier from 0% to 90% duty cycle is from 2. 4.05 V. Figure 22. Voltage Mode Operation MC34023, MC33023 PIN FUNCTION DESCRIPTION Description , however an external reference can also be used. ref sets the charge current through timing Capacitor the timing Capacitor sets the switching frequency ...
Page 12
... Figure 26B. Slope Compensation (Noise Immune) MC34023, MC33023 I Sense The addition filter will eliminate instability caused by the leading edge spike on the current waveform. This sense signal can also be used at the ramp input pin for current mode control. For ramp compensation it is necessary to know the gain of the current feedback loop ...
Page 13
... Master 6 Oscillator Figure 30. Synchronization Over Long Distances MC34023, MC33023 5 The sync pulse fed into the clock pin must be at least 3 need to be set 10% slower than the sync frequency. This circuit is also used in Voltage Mode operation for master/slave operation. The clock signal would be coming from the master which is set at the desired operating frequency, while the slave is set 10% slower ...
Page 14
... MOSFET switching speed. A Schottky diode can reduce the driver’s power dissipation due to excessive ringing, by preventing the output pin from being driven below ground. The Schottky diode also prevents substrate injection when the output pin is driven below ground. Figure 33. MOSFET Parasitic Oscillations MC34023, MC33023 + − ...
Page 15
... MC34023, MC33023 + Figure 35. Application Circuit http://onsemi.com 15 ...
Page 16
... Figure 36. PC Board With Components MC34023, MC33023 6.5″ (Top View) http://onsemi.com 16 1500 pF 4.0″ 1500 pF ...
Page 17
... MC34023, MC33023 (Top View) 6.5″ (Bottom View) Figure 37. PC Board Without Components http://onsemi.com 17 4.0″ ...
Page 18
... 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 MC34023, MC33023 PACKAGE DIMENSIONS PDIP−16 P SUFFIX CASE 648−08 ...