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参数资料
| 型号： | PJ3800CA |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 6/8页 |
| 文件大小： | 330K |
| 代理商： | PJ3800CA |
PJ3800
Low Voltage Switching Regulator Controller
6-8
2003/04.rev.A
(Continued)
1. Switching Regulator Function
(1) Reference voltage circuit
The reference voltage circuit generates a temperature-compensated reference voltage (@1.25V) from voltage supplied from the
power supply pin. In addition to providing the reference voltage for the switching regulator, the circuit also sets the idle period.
(2) Saw tooth wave oscillator
The saw tooth oscillator generates a saw tooth wave (up to 1 MHz) that is stable with respect to the supply voltage and
temperature. The capacitor and resistor that set the oscillation frequency are connected to the OSC pin (pin 7).
(3) Error amplifier (Error Amp.)
The error amplifier detects the output voltage of the switching regulator and outputs the PWM control signal. The voltage gain is
fixed, and connecting a phase compensation capacitor to the FB pin (pin 8) provides stable phase
compensation for the system.
(4) PWM comparator (PWM Comp.)
The voltage comparator has one inverting and three non-inverting inputs. The comparator is a voltage/pulse width converter that
controls the ON time of the output pulse depending on the input voltage. The output level is high (H) when the saw tooth wave is
lower than the error amplifier output voltage, soft start setting voltage, and idle period setting voltage.
(5) Output circuit
The output circuit has a totem pole type configuration and can drive an external NPN transistor directly. The value of the ON/OFF
current can be set by a resistor connected to the BR/CTL pin .
2. Power Supply Control Function
Stand-by mode (supply current 1 mA or less) can be set by connecting the BR/CTL pin to VCC or by making the pin open circuit.
PJ3800
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| PJ3800CS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Voltage Switching Regulator Controller |
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