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PDF AN8015SH Data sheet ( Hoja de datos )
| Número de pieza | AN8015SH | |
| Descripción | Single-channel step-down/ step-up/ or inverting use DC-DC converter control IC | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN8015SH (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Voltage Regulators
AN8015SH
Single-channel step-down, step-up, or inverting use
DC-DC converter control IC
s Overview
The AN8015SH is a single-channel DC-DC converter
control IC using the PWM method.
1 10
This IC can provide any one output type from among
step-down, step-up and inverting output.
56
Its operating supply voltage range is wide and its
consumption current is small. In addition, since it uses the
10-pin surface mounting type package with 0.5 mm pitch,
it is suitable for highly efficient miniature potable power
supply, especially for a negative output power supply.
s Features
• Wide operating supply voltage range (3.6 V to 34 V)
• Small consumption current (1.8 mA typical)
• Converter control in a wide output frequency range is
0.5±0.2
4.3±0.30
6.3±0.30
SSOP010-P-0225
possible (2 kHz to 500 kHz).
• Built-in timer latch short-circuit protection circuit (charge current 1.1 µA typical)
• Incorporating the under-voltage lock-out (U.V.L.O.) circuit
• Incorporating a high precision reference voltage circuit (2.46 V (allowance: ± 3%))
• Output block is open-collector (darlington) type.
• High absolute maximum rating of output current (100 mA)
• Maximum duty ratio is fixed and has small sample-to-sample variations (90% ± 5%).
• Using 10-pin small outline package of 0.5 mm pitch
Unit: mm
s Applications
• LCD displays, digital still cameras, and PDAs
s Block Diagram
Reference
supply 2.46 V
(allowance : ± 3%)
0.5 V
Triangular
wave OSC
1.2 V
0.37 V
PWM
comparator
5 Out
IN+ 8 Error amp. S.C.P. comp.
IN− 9
FB 10
1.83 V
Clamp
I VREF
1.11 V
SR R O
Latch U.V.L.O.
4 GND
1
1 page  
Voltage Regulators
s Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
5
VREF
5
AN8015SH
Description
Out:
Open-collector type (darlington) output terminal.
The absolute maximum rating of output current is
100 mA
Use with a steady-state output current under 50
mA.
I/O
O
6
7
VCC
VCC:
6 The terminal for applying supply voltage.
Use with a operating supply voltage within the
range of 3.6 V to 34 V.
VREF overcurrent detection
Bias to other block
7
VREF:
The output terminal for the reference voltage (2.46
V)
Use with a load current −3 mA or under.
This terminal is incorporating the short-circuit
protection circuit, and the short-circuit current is
about −20 mA. Use the VREF for the reference
input setting of the error amplifier.
O
8
VREF
IN+:
The noninverted input terminal of the error ampli-
fier.
For common-mode input, use in the range of − 0.1
V to +0.8 V.
I
9
9
IN−: I
8 The inverted input terminal of the error amplifier.
For common-mode input, use in the range of − 0.1
V to +0.8 V.
10
VREF
FB:
The output terminal of the error amplifier.
O
120 µA
CT
PWM
The source current is about −120 µA, and the sink
current is about 8 mA.
Correct the frequency characteristics of the gain
8 mA
10
and the phase by connecting a resistor and a ca-
pacitor between this terminal and IN− terminal.
5
5 Page 
Voltage Regulators
AN8015SH
s Application Notes (continued)
[4] Triangular wave oscillation circuit (continued)
2. Usage notes
This IC uses the constant current given by the timing resistor RT as the bias current of the triangular oscillation
block and the PWM comparator for consumption current reduction. The total consumption current is approximately
1.8 mA (typical) when RT is 15 kΩ, and it increases to approximately 2.5 mA (typical) when RT is 5.6 k Ω. In order
to obtain the steady-state output current of 100 mA at the open collector output, it is necessary to set RT value to
15 kΩ or smaller.
It is possible to use the circuit in the recom-
mended operating range of 2 kHz to 500 kHz of the
1M
oscillation frequency. However, the timing resistor
500 k
RT versus the oscillation frequency should be set
within the recommended range shown in figure 5.
Also, refer to the "Applications Notes, [1] Main
100 k
Recommended operating
condition
characteristics, Timing capacitance Oscillation
frequency" for setting the timing capacitance.
For a high frequency use, the overshoot and un-
10 k
dershoot amounts increase due to operation delay
of the triangular oscillation comparator, and the
maximum duty ratio drops. This effect can be alle-
viated by speeding up through the reduction of the
1k
5 k 5.6 k
10 k
15 k
resistor RT and increase in the circuit current.
Note that this IC can not be used as an IC for
slave when the several ICs are operated in parallel
Timing resistance RT (Ω)
Figure 5. Timing resistance recommended condition
synchronous mode.
[5] Time constant setting method for short-circuit protection circuit with joint-use of soft start/timer latch type
The constructional block diagram of protection latch circuit is shown in figure 6. The comparator for short-circuit
protection compares the output of error amplifier VFB with the reference voltage of 1.85 V at all the time.
When the load conditions of DC-DC converter output is stabilized, there is no fluctuation of error amplifier
output and the short-circuit protection comparator also keeps the balance. At this moment, the output transistor Q1 is
in the conductive state and the S.C.P. terminal is hold to approximately 1.25 V through the clamp circuit.
When the load conditions suddenly change, and high-level signal (1.85 V or higher) is input from the error amplifier
to the noninverted input of the short-circuit protection comparator, the short-circuit protection comparator outputs the
low-level signal. Since this signal cuts off the output transistor Q1, the S.C.P. terminal voltage VPE is released, and the
externally connected capacitor CS starts charging according to the following equation:
VPE = VSTBY + ICHG ×
tPE
CS
[V]
1.83 V = 1.25 V + ICHG ×
tPE
CS
CS
=
ICHG
×
tPE
0.58
[F]
ICHG is the constant current determined by the oscillation timing resistor RT and its dispersion and fluctuation with
temperature are small. ICHO is expressed in the following equation:
ICHG
=
VRT
RT
×
1
30
[A]
VRT is approximately 0.5 V and ICHO becomes approximately 1.1 µA when RT = 15 kΩ.
11
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| PDF Descargar | [ Datasheet AN8015SH.PDF ] | |
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