參數(shù)資料
型號(hào)： AN8049FHN
廠商： PANASONIC CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： 1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC
中文描述： SPECIALTY ANALOG CIRCUIT, QCC24
封裝： 4 X 5 MM, PLASTIC, QFN-24
文件頁(yè)數(shù)： 17/23頁(yè)
文件大?。?/td> 170K
代理商： AN8049FHN
Voltage Regulators
AN8049FHN
17
I
Application Notes (continued)
[4] Function descriptions (continued)
7. Low input voltage malfunction prevention circuit (U.V.L.O.)
This circuit protects the system against degradation or destruction due to incorrect control operation when the
power supply voltage falls during power on or power off.
The low input voltage malfunction prevention circuit detects the internal reference voltage that changes with
the supply voltage level. While the supply voltage is rising, this circuit cuts off the output drive transistor until the
reference voltage reaches 1.67 V. It also sets the dead-time to 100% and at the same time holds the S.C.P. pin (pin
23) and the DT pins (pins 1, 2, and 24) at 0 V, and the OSC pin (pin 15) at about 1.2 V.
8. PWM comparators
The PWM comparators control the on-period of the output pulse according to their input voltage.
The output transistors are turned on during periods when the OSC pin (pin 15) triangular wave is lower than
both of the corresponding FB pin (pins 18, 20, or 22) and the corresponding DT pin (pins 1, 2, or 24).
The PWM 2 circuit turns the output transistor on during periods when OSC pin (pin 15) triangular wave is at
a higher level than both of the FB2 pin (pin 20) and the DT2 pin (pin 1).
The maximum duty is set to 86% internally, but it can be set to a value lower than 86% by inserting a resistor
between the corresponding DT pin and ground, and can be set to a value higher than 86% by inserting a resistor
between the corresponding DT pin and the V
REF
pin.
The IC's soft start function operates to gradually increase the width of the output pulse on-period during startup
if a capacitor is inserted between the DT pin and ground.
9. Output 1 and output 2 blocks
These output circuits have a totem pole structure. A constant-current source output with good line regulation
can be set up freely by connecting current setting resistors to the RB pins.
These circuits can provide a constant-current source output of up to 50 mA.
10. Output 3 block
This output circuit has an open collector structure.
An output current of up to 50 mA can be provided, and the output pin has a breakdown voltage of 15 V.
11. CTL block
The CTL block output circuit also has a totem pole structure. A constant-current source output with good line
regulation can be set up freely by connecting current setting resistors to the RB2 pin.
The CTL block can provide a constant-current source output of up to 50 mA.
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