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CS5651GDWR16 датащи(PDF) 5 Page - Cherry Semiconductor Corporation |
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CS5651GDWR16 датащи(HTML) 5 Page - Cherry Semiconductor Corporation |
5 / 8 page 5 The CS5651 is a high performance, fixed frequency, dual channel current mode PWM controller for Off-Line and DC to DC converter applications. Each channel contains a high gain error amplifier, current sensing comparator, pulse width modulator latch, and totem pole output driv- er. The oscillator, reference, and undervoltage lockout cir- cuits are common to both channels. The oscillator has both precise frequency and duty cycle control. The oscillator frequency is programmed by the timing components RT and CT. Capacitor CT is charged and discharged by an equal magnitude internal current source and sink, that generates a symmetrical 50 percent duty cycle waveform at CT. The oscillator peak and valley thresholds are 3.5V and 1.6V respectively. The source/ sink current is controlled by resistor RT. For proper opera- tion over temperature range RT’s value should be between 4.0kΩ to 16kΩ. As CT charges and discharges, an internal blanking pulse is generated that alternately drives the inputs of the upper and lower NOR gates high. This, in conjunction with a precise amount of delay time introduced into each chan- nel, produces well defined non-overlapping output duty cycles. Output 2 is enabled while CT is charging, and Output 1 is enabled during the discharge. Even at 500kHz, each output is capable of approximately 44% duty cycle, making this controller suitable for high frequency power conversion applications. In noise sensitive applications it may be necessary to syn- chronize the converter with an external system clock. This can be accomplished by applying an external clock signal. For reliable synchronization, the oscillator frequency should be set about 10% slower than the clock frequency. The rising edge of the clock signal applied to SYNC, termi- nates the charging of CT and VOUT 2 conduction. By tailor- ing the clock waveform symmetry, accurate duty cycle clamping of either output can be achieved. Each channel contains a fully-compensated error amplifier with access to the output and inverting input. The amplifi- er features a typical dc voltage gain of 100 dB, and a unity gain bandwidth of 1.0 MHz with 71 degrees of phase mar- gin. The non-inverting input is internally biased at 2.5V. The converter output voltage is typically divided down and monitored by the inverting input through a resistor divider. The maximum input bias current is -1.0 µA which will cause an output voltage error that is equal to the product of the input bias current and the equivalent input divider resistance. Its output voltage is offset by two diode drops (≈1.4V) and divided by three before it connects to the inverting input of the current sense comparator. This guarantees that both Operating Description Typical Performance Characteristics: continued 0 20 40 60 80 100 120 I ref, REFERENCE SOURCE CURRENT (mA) -24 -20 -16 -12 -8.0 -4.0 0 VCC = 15V TA = –55°C TA = 125°C TA = 25°C -55 -25 0 25 50 75 100 125 TA, AMBIENT TEMPERATURE (°C) 120 100 80 60 Reference Short Circuit Current vs. Temperature Reference Voltage Change vs. Source Current SOURCE SATURATION (LOAD TO GROUND) VCC=15V 80µS PULSED LOAD 120Hz RATE TA=25°C TA= –55°C TA= –55°C TA=25°C SINK SATURATION (LOAD TO VCC) GND 0 200 400 600 800 OUTPUT LOAD CURRENT (mA) VCC 0 -1.0 -2.0 2.0 1.0 0 0 4.0 8.0 12 16 20 VCC, SUPPLY VOLTAGE (V) - CS-5651 0 8.0 16 24 32 RT=8.2kΩ CT=3.3nF VFB 1, 2=0V CURRENT SENSE 1, 2=0V TA=25°C Supply Current vs. Supply Voltage Output Saturation Voltage vs. Load Current Oscillator Error Amplifier |
Аналогичный номер детали - CS5651GDWR16 |
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Аналогичное описание - CS5651GDWR16 |
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