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Part Number: AZ3845
Description: The AZ3842/3/4/5 are high performance fixed frequency current-mode PWM controller series.These...
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AZ3845
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General Description
AZ3845 General Description
The AZ3842/3/4/5 are high performance fixed frequency current-mode PWM controller series.
These integrated circuits are optimized for off-line and DC-DC converter applications with minimum external components. They feature under-voltage lockout (UVLO) circuit for low start-up current, trimmed oscillator for precise duty cycle control, current sense comparator providing maximum current limiting and a totem pole output stage for increasing output current. In addition, these ICs also feature accurate protection against over-temperature, over-current and maximal output power.
The AZ3842 and AZ3844 have UVLO thresholds of 15.5V(on) and 10V(off); The corresponding thresholds for AZ3843 and AZ3845 are 8.4 V(on) and 7.8V(off). The AZ3842 and AZ3843 can operate approaching 100% duty cycle; AZ3844 and AZ3845 can operate from zero to 50% duty cycle.
These ICs are available in 3 packages: SOIC-8, DIP-8 and SOIC-14.
AZ3845 Maximum Ratings
| Parameter | Symbol | Value | Unit |
| Supply Voltage | Vcc | 30 | V |
| Output Current | Io | 1 | A |
| Analog Inputs (8-pin: pin2,3, 14-pin: pin3,5) | V(ANA) | -0.3 to 6.3 | V |
| Error Amp Output Sink Current | ISINK(E.A) | 10 | mA |
| Power Dissipation at TA< 25 oC (DIP-8) | PD (Note 3) | 1000 | mW |
| Power Dissipation at TA<25 oC (SOIC-8) | PD (Note 3) | 460 | mW |
| Power Dissipation at TA<25 oC (SOIC-14) | PD (Note 3) | 725 | mW |
| Storage Temperature Range | TSTG | -65 ~+150 | oC |
| Lead Temperature (Soldering, 10sec) | TLEAD | +300 | oC |
AZ3845 Features
· Robust VREF Line/Load Regulation Low Line Regulation : 4mV Low Load Regulation : 4mV
· High Stability of Reference Voltage over a Full Temperature Range: 0.2mV/ oC
· Operating Frequency up to 500KHz
· High PWM Frequency Stability over a Full Temperature Range: 2.5%
· High PWM Frequency Stability under a Full Supply Voltage Range: 0.2%
· Accurate Over-temperature Protection with Hysteresis
· UVLO with Hysteresis
· High Stability of Reference Voltage over a Full Temperature Range: 0.2mV/ oC
· Operating Frequency up to 500KHz
· High PWM Frequency Stability over a Full Temperature Range: 2.5%
· High PWM Frequency Stability under a Full Supply Voltage Range: 0.2%
· Accurate Over-temperature Protection with Hysteresis
· UVLO with Hysteresis
AZ3845 Typical Application
· Off-line Converter
· DC-DC Converter
· Voltage Adapter
· CRT Monitor Power Supply
· Desktop Power Supply
· DVD/STB Power Supply
· DC-DC Converter
· Voltage Adapter
· CRT Monitor Power Supply
· Desktop Power Supply
· DVD/STB Power Supply
AZ3845 Connection Diagram
AZ317H-E1
PDF/DataSheet Download
- Datasheet: AZ317H-E1
- File Size: 200091 KB
- Manufacturer: BCD Semiconductor Manufacturing Limited
- Click here to Download
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AZ3845 Relative Products
AZ3844
The AZ3842/3/4/5 are high performance fixed frequency current-mode PWM controller series.The AZ3842/3/4/5 are optimized for off-line and DC-DC converter applications with minimum external components. They feature under-voltage lockout (UVLO) circuit for low ...
AZ3843
The AZ3842/3/4/5 are high performance fixed frequency current-mode PWM controller series.The AZ3842/3/4/5 are optimized for off-line and DC-DC converter applications with minimum external components. They feature under-voltage lockout (UVLO) circuit for low ...
AZ3842
The AZ3842/3/4/5 are high performance fixed frequency current-mode PWM controller series.The AZ3842/3/4/5 are optimized for off-line and DC-DC converter applications with minimum external components. They feature under-voltage lockout (UVLO) circuit for low ...
AZ358C
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