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High Performance Current Mode Controllers
The MC34129/MC33129 are high performance current mode switching regulators specifically designed for use in low power digital telephone applications. These integrated circuits feature a unique internal fault timer that provides automatic restart for overload recovery. For enhanced system efficiency, a start/run comparator is included to implement bootstrapped operation of VCC. Other functions contained are a temperature compensated reference, reference amplifier, fully accessible error amplifier, sawtooth oscillator with sync input, pulse width modulator comparator, and a high current totem pole driver ideally suited for driving a power MOSFET. Also included are …ver más…

Tlow = 0°C for MC34129 –40°C for MC33129 Thigh = +70°C for MC34129 +85°C for MC33129

Symbol

Min

Typ

Max

Unit

Vref 1.225 2.375 Vref 1.200 2.250 Regline – – Regload – – 1.0 3.0 12 25 2.0 10 12 50 – – 1.300 2.750 1.250 2.500 1.275 2.625

V

V

mV

mV

VIO – – IIO IIB – – VICR AVOL GBW PSRR ISource VOH VOL – 65 500 65 40 1.75 – 25 – 0.5 to 5.5 87 750 85 80 1.96 0.1 – 200 – – – – – 2.25 0.15 – 1.5 – 10 – 10 –

mV

nA nA

V dB kHz dB µA V

2

MOTOROLA ANALOG IC DEVICE DATA

MC34129 MC33129
ELECTRICAL CHARACTERISTICS (VCC = 10 V, TA = 25°C [Note 1], unless otherwise noted.)
Characteristics PWM COMPARATOR Input Offset Voltage (Vin = 1.25 V) Input Bias Current Propagation Delay, Ramp Input to Drive Output SOFT–START Capacitor Charge Current (Pin 12 = 0 V) Buffer Input Offset Voltage (Vin = 1.25 V) Buffer Output Voltage (ISink = 100 µA) FAULT TIMER Restart Delay Time START/RUN COMPARATOR Threshold Voltage (Pin 12) Threshold Hysteresis Voltage (Pin 12) Output Voltage (ISink = 500 µA) Output Off–State Leakage Current (VOH = 15 V) Output Zener Voltage (IZ = 10 mA) OSCILLATOR Frequency (RT = 25.5 kΩ, CT = 390 pF) Capacitor CT Discharge Current (Pin 5 = 1.2 V) Sync Input Current High State (Vin = 2.0 V) Low State (Vin = 0.8 V) Sync