Details, datasheet, quote on part number: MC34025P
PartMC34025P
CategoryPower Management => AC-DC Controllers/Converters => AC-DC Switching => Off-Line Controllers
TitleOff-Line Controllers
DescriptionHi-spd PWM Controller , Package: Soic, Pins=16
CompanyON Semiconductor
DatasheetDownload MC34025P datasheet
Cross ref.Similar parts: UC1825, UC1825-SP, UC1825A-SP, UC2823, UC2823A, UC2824, UC2825, UC2825A, UC2825B, UC2825M
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Features, Applications

The MC34025 series are high speed, fixed frequency, double-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 components. These integrated circuits feature an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high speed current sensing comparator, steering flip-flop, and dual high current totem pole outputs ideally suited for driving power MOSFETs. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering. The flexibility of this series allows to be easily configured for either current mode or voltage mode control. 50 ns Propagation Delay to Outputs Dual High Current Totem Pole Outputs Wide Bandwidth Error Amplifier Fully-Latched Logic with Double Pulse Suppression Latching PWM for Cycle-By-Cycle Current Limiting Soft-Start Control with Latched Overcurrent Reset Input Undervoltage Lockout with Hysteresis Low Start-Up Current (500 mA Typ) Internally Trimmed Reference with Undervoltage Lockout 45% Maximum Duty Cycle (Externally Adjustable) Precision Trimmed Oscillator Voltage or Current Mode Operation to 1.0 MHz Functionally Similar to the UC3825

16 Vref Clock 6 7 Latching PWM and Steering Flip Flop 4 5 Oscillator 15 VCC

PDIP-16 P SUFFIX CASE SO-16L DW SUFFIX CASE 4 = Assembly Location = Wafer Lot = Year = Work Week MC3x025DW AWLYYWW MC3x025P AWLYYWW

Error Amp Inverting Input Error Amp Noninverting Input Error Amp Output Clock RT CT
Vref VCC Output B VC Power Ground Output A Ground Current Limit/ Shutdown
Ramp Error Amp 3 Output Noninverting 2 Input Inverting Input 1 8 Soft-Start

11 Output A Power 12 Ground 9 Current Limit/ Shutdown Device MC34025DWR2 MC34025P Package SO-16L PDIP-16 Shipping 47 Units/Rail 1000 Tape & Reel 25 Units/Rail 47 Units/Rail 1000 Tape & Reel 25 Units/Rail

Soft-Start 10 Ground This device contains 227 active transistors.

Rating Power Supply Voltage Output Driver Supply Voltage Output Current, Source or Sink (Note 1) DC Pulsed (0.5 ms) Current Sense, Soft-Start, Ramp, and Error Amp Inputs Error Amp Output and Soft-Start Sink Current Clock and RT Output Current Power Dissipation and Thermal Characteristics SO-16 Package (Case 751G) Maximum Power Dissipation + 25C Thermal Resistance, Junction-to-Air DIP Package (Case 648) Maximum Power Dissipation + 25C Thermal Resistance, Junction-to-Air Operating Junction Temperature Operating Ambient Temperature (Note MC34025 MC33025 Storage Temperature Range Symbol VCC 0.5 2.0 Vin IO ICO V mA Value 30 25 Unit V A

ELECTRICAL CHARACTERISTICS (VCC = 3.65 kW, = 1.0 nF, for typical values + 25C, for min/max values TA

is the operating ambient temperature range that applies [Note 2], unless otherwise noted.) Characteristic REFERENCE SECTION Reference Output Voltage (IO = 1.0 mA, + 25C) Line Regulation (VCC 30 V) Load Regulation (IO to 10 mA) Temperature Stability Total Output Variation over Line, Load, and Temperature Output Noise Voltage to 10 kHz, + 25C) Long Term Stability (TA = +125C for 1000 Hours) Output Short Circuit Current OSCILLATOR SECTION Frequency + 25C Line (VCC 30 V) and Temperature (TA = Tlow to Thigh) Frequency Change with Voltage (VCC 30 V) Frequency Change with Temperature (TA = Tlow to Thigh) Sawtooth Peak Voltage Sawtooth Valley Voltage Clock Output Voltage High State Low State kHz fosc Dfosc/DV Dfosc/DT VP VV VOH VOL V Vref Regline Regload TS Vref Vn S ISC V mV mV/C mV mA Symbol Min Typ Max Unit

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. Thigh = +70C for MC34025 Tlow = 0C for MC34025 Tlow - 40C for MC33025 Thigh = +105C for MC33025

ELECTRICAL CHARACTERISTICS (VCC = 3.65 kW, = 1.0 nF, for typical values + 25C, for min/max values TA is the operating ambient temperature range that applies [Note 4], unless otherwise noted.)

Characteristic ERROR AMPLIFIER SECTION Input Offset Voltage Input Bias Current Input Offset Current Open-Loop Voltage Gain (VO 4.0 V) Gain Bandwidth Product (TJ + 25C) Common Mode Rejection Ratio (VCM 5.5 V) Power Supply Rejection Ratio (VCC 30 V) Output Current, Output Voltage Swing, Slew Rate PWM COMPARATOR SECTION Ramp Input Bias Current Duty Cycle of Each Output, Zero Duty Cycle Threshold Voltage Pin 3(4) (Pin 0 V) Propagation Delay (Ramp Input to Output, + 25C) SOFT-START SECTION Charge Current (VSoft-Start 0.5 V) Discharge Current (VSoft-Start 1.5 V) CURRENT SENSE SECTION Input Bias Current (Pin 4.0 V) Current Limit Comparator Com arator Threshold Shutdown Comparator Threshold Propagation Delay (Current Limit/Shutdown to Output, + 25C) OUTPUT SECTION Output Voltage Low State High State V (ISink = 20 mA) (ISink = 200 mA) (ISource = 20 mA) (ISource = 200 mA) VOL VOH VOL(UVLO) mA ns IIB Vth tPLH(in/out) V ns Ichg Idischg mA Maximum Minimum IIB DC(max) DC(min) Vth tPLH(in/out) V ns Source (VO 4.0 V) Sink (VO 1.0 V) High State (IO - 0.5 mA) Low State (IO = 1.0 mA) VIO IIB IIO AVOL GBW CMRR PSRR ISource ISink VOH VOL mA dB MHz mA V V/ms Symbol Min Typ Max Unit

Output Voltage with UVLO Activated (VCC 6.0 V, ISink = 0.5 mA) Output Leakage Current (VC 20 V) Output Voltage Rise Time (CL = 1.0 nF, + 25C) Output Voltage Fall Time (CL = 1.0 nF, + 25C) UNDERVOLTAGE LOCKOUT SECTION Start-Up Threshold (VCC Increasing) UVLO Hysteresis Voltage (VCC Decreasing After Turn-On) TOTAL DEVICE Power Supply Current Start-Up (VCC 8.0 V) Operating

3. Maximum package power dissipation limits must be observed. 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Thigh = +70C for MC34025 Tlow = 0C for MC34025 Tlow - 40C for MC33025 Thigh = +105C for MC33025


 

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