16114FP Renesas, 16114FP Datasheet - Page 12

• Manufacturer Part Number: 16114FP
• Description: Search -----> HA16114FP
• Manufacturer: Renesas

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HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
2.2 Error Amplifier Usage
Figure 2.3 shows an equivalent circuit of the error amplifier. The error amplifier in these ICs is a simple
NPN-transistor differential amplifier with a constant-current-driven output circuit.
The amplifier combines a wide bandwidth (f
stable feedback to be applied when the power supply is designed. Phase compensation is also easy.
3. Dead-Band Duty Cycle and Soft-Start Settings
3.1 Dead-Band Duty Cycle Setting
The dead-band duty cycle (the maximum duty cycle of the PWM pulse output) can be programmed by the
voltage V
resistors. The dead-band duty cycle (DB) and V
Note: V
Vref is typically 2.5 V. Select R
Rev.1, Dec. 2000, page 10 of 38
V
DB
V
V
DB =
V
TL
DB
DB
TH
DB
: 1.0 V (Typ)
: 1.6 V (Typ)
IC internal V
at the DB pin. A convenient way to obtain V
is the voltage at the DB pin.
R
R
To Vref
= Vref ×
1
2
V
V
TH
TH
DB
− V
IN(−)
IN(+)
− V
R
Sawtooth
wave
DB
IN
TL
1
E/O
R
+ R
2
× 100 (%)
Figure 2.3 Error Amplifier Equivalent Circuit
2
Figure 3.1 Dead-Band Duty Cycle Setting
−
+
+
1
and R
from
UVL
PWM
COMP
⋅ ⋅ ⋅ ⋅ This applies when V
2
so that 1.0 V ≤ V
If V
80 µA
T
DB
= 4 MHz) with a low open-loop gain (50 dB Typ), allowing
DB
< V
V
V
V
Note:
can be calculated as follows.
TH
DB
TL
TL
, there is no PWM output.
V
Select constants by testing under implementation
conditions.
TH
DB
DB
is to divide the IC’s Vref output by two external
and V
≤ 1.6 V.
DB
TL
> V
Sawtooth wave
vary depending on the oscillator.
40 µA
TL
.
Dead band
To internal PWM
comparator
E/O
Voltage at DB pin
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