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參數(shù)資料
| 型號： | AN8049FHN |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調(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 |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 170K |
| 代理商： | AN8049FHN |
Voltage Regulators
AN8049FHN
15
I
Application Notes (continued)
[4] Function descriptions
1. Reference voltage block
This circuit is composed of a band gap circuit, and outputs a 1.26 V (typical) reference voltage that is
temperature compensated to a precision of
±
1%. This reference voltage is stabilized when the supply voltage is 1.8
V or higher. This reference voltage is used by error amplifiers 1 and 2.
2. Triangular wave generator
This circuit generates a triangular wave like a
sawtooth with a peak of 0.7 V and a trough of 0.2 V
using a capacitor C
T
(for the time constant) and resistor
R
T
connected to the OSC pin (pin 15). The oscillator
frequency can be set to an arbitrary value by selecting
appropriate values for the external capacitor and resis-
tor, C
T
and R
T
. This IC can use an oscillator frequency
in the range 20 kHz to 1 MHz. The triangular wave
signal is provided to the noninverting input of the PWM
comparator in each channel internally to the IC. Use
the formulas below for rough calculation of the oscilla-
tor frequency.
Note, however, that the above formulas do not take the rapid charge time, overshoot, and undershoot into
account. See the experimentally determined graph of the oscillator frequency vs. timing capacitance value pro-
vided in the main characteristics section.
3. Error amplifier 1
This circuit is an npn-transistor input error amplifier
that detects and amplifies the DC-DC converter output
voltage, and inputs that signal to a PWM comparator.
The 1.26 V internal reference voltage is applied to the
noninverting input. Arbitrary gain and phase compen-
sation can be set up by inserting a resistor and capacitor
in series between the FB1 pin (pin 22) and the IN
±
1 pin
(pin 21). The output voltage V
OUT1
can be set using the
circuit shown in the figure.
f
OSC
≈
1
≈
0.8
×
1
(Hz)
C
T
×
R
T
×
lnV
OSCL
C
T
×
R
T
V
OSCH
Figure 1. Triangular oscillator waveform
Figure 2. Connection method of error amplifier 1
(Step-up output)
t
2
t
1
T
V
OSCH
0.7 V
V
OSCL
0.2 V
Discharge
Rapid charge
21
22
1.26 V
IN
1
To the PWM
comparator input
R2
R1
FB1
V
OUT1
Error
amplifier 1
V
OUT1
=
1.26
×
R
1
+
R
2
R
2
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