TL594 Precision Switchmode Pulse Width Modulation Control Circuit The TL594 is a fixed frequency, pulse width modulation control circuit designed primarily for Switchmode power supply control. TL594 RECOMMENDED OPERATING CONDITIONS Characteristics Symbol Min Typ Max Unit Power Supply Voltage V 7.0 15 40 V CC Collector Output Voltage V , V 30 40 V C1 C2 Collector Output Current (Each transistor) I , I 200 mA C1 C2 Amplified Input Voltage V 0.3 V 2.0 V in CC Current Into Feedback Terminal l 0.3 mA fb Reference Output Current l 10 mA ref Timing Resistor R 1.8 30 500 k T Timing Capacitor C 0.0047 0.001 10 F T Oscillator Frequency f 1.0 40 300 kHz osc PWM Input Voltage (Pins 3, 4, 13) 0.3 5.3 V ELECTRICAL CHARACTERISTICS (V = 15 V, C = 0.01 F, R = 12 k , unless otherwise noted.) CC T T For typical values T = 25C, for min/max values T is the operating ambient temperature range that applies, unless otherwise noted. A A Characteristics Symbol Min Typ Max Unit REFERENCE SECTION Reference Voltage V V ref (I = 1.0 mA, T = 25C) 4.925 5.0 5.075 O A (I = 1.0 mA) 4.9 5.1 O Line Regulation (V = 7.0 V to 40 V) Reg 2.0 25 mV CC line Load Regulation (I = 1.0 mA to 10 mA) Reg 2.0 15 mV O load Short Circuit Output Current (V = 0 V) I 15 40 75 mA ref SC OUTPUT SECTION Collector OffState Current (V = 40 V, V = 40 V) I 2.0 100 A CC CE C(off) Emitter OffState Current (V = 40 V, V = 40 V, V = 0 V) I 100 A CC C E E(off) CollectorEmitter Saturation Voltage (Note 1) V CommonEmitter (V = 0 V, I = 200 mA) V 1.1 1.3 E C SAT(C) EmitterFollower (V = 15 V, I = 200 mA) V 1.5 2.5 C E SAT(E) Output Control Pin Current A Low State (V 0.4 V) I 0.1 OC OCL High State (V = V ) I 2.0 20 OC ref OCH Output Voltage Rise Time t ns r CommonEmitter (See Figure 13) 100 200 EmitterFollower (See Figure 14) 100 200 Output Voltage Fall Time t ns f CommonEmitter (See Figure 13) 40 100 EmitterFollower (See Figure 14) 40 100 ERROR AMPLIFIER SECTION Input Offset Voltage (V = 2.5 V) V 2.0 10 mV O (Pin 3) IO Input Offset Current (V = 2.5 V) I 5.0 250 nA O (Pin 3) IO Input Bias Current (V = 2.5 V) I 0.1 1.0 A O (Pin 3) IB Input Common Mode Voltage Range (V = 40 V, T = 25C) V 0 to V 2.0 V CC A ICR CC Inverting Input Voltage Range V 0.3 to V 2.0 V IR(INV) CC Open Loop Voltage Gain ( V = 3.0 V, V = 0.5 V to 3.5 V, R = 2.0 k ) A 70 95 dB O O L VOL UnityGain Crossover Frequency (V = 0.5 V to 3.5 V, R = 2.0 k ) f 700 kHz O L C Phase Margin at UnityGain (V = 0.5 V to 3.5 V, R = 2.0 k ) m 65 deg. O L Common Mode Rejection Ratio (V = 40 V) CMRR 65 90 dB CC Power Supply Rejection Ratio ( V = 33 V, V = 2.5 V, R = 2.0 k ) PSRR 100 dB CC O L Output Sink Current (V = 0.7 V) I 0.3 0.7 mA O (Pin 3) O Output Source Current (V = 3.5 V) I + 2.0 4.0 mA O (Pin 3) O 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.