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PDF AP2008 Data sheet ( Hoja de datos )
| Número de pieza | AP2008 | |
| Descripción | PWM Buck Controller | |
| Fabricantes | Anachip | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP2008 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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PWM Buck Controller
Features
- PWM Buck Control Circuitry
- Operating voltage can be up to 20V
- Under voltage Lockout (UVLO) Protection
- Short Circuit Protection (SCP)
- Soft-start circuit
- Variable Oscillator Frequency -- 300KHz Max
- 0.77V voltage reference Output
- 8-pin PDIP and SOP packages
Applications
- Backlight inverter
- LCD Monitor
- XDROM, XDSL Product
- DC/DC converters in computers, etc.
Pin Assignment
( Top View )
OUT
VCC
COMP
FB
1
2
3
4
8 GND
7 CT
6 SS
5 SCP
PDIP/SOP
AP2008
General Description
The AP2008 integrates Pulse-Width-Modulation
(PWM) control circuit into a single chip, mainly
designs for power-supply regulator. All the functions
included an on-chip 0.77V reference output, an
error amplifier, an adjusted oscillator, a soft-start,
UVLO, SCP circuitry, and a push-pull output circuit.
Switching frequency can be adjustable by trimming
CT. During low VCC situation, the UVLO makes
sure that the outputs are off until the internal circuit
is operational normally.
Pin Descriptions
Name
CT
FB
SS
COMP
OUT
GND
VCC
SCP
Description
Timing Capacitor
Voltage Feedback
Soft-Start.
Feedback Loop Compensation
PWM Output
Ground
Supply Voltage
Short Circuit Protection
Ordering Information
AP2008 X X X
Package
Lead Free
Packing
N: PDIP-8L Blank : Normal
Blank : Tube
S: SOP-8L L : Lead Free Package A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 1.0 Oct 11, 2004
1/8
1 page  
PWM Buck Controller
AP2008
Typical Application Circuit
R3 30K
C2
10nF
(Optional)
C4 270pF
C5 50nF
C6 220nF
Q1
P mos
L1
10uH
5A R1
1K
R2
4K
Vcc = 12V
C1
470uF
Output
1V/5A
C4
50nF
(Optional)
C3
470uF
Step-Down DC/DC converter
Typical Characteristics
REFERENCE OUTPUT VOLTAGE
v.s.
POWER-SUPPLY VOLTAGE
0.785
0.78
0.775
0.77
0.765
0.76
0.755
4 6 8 10 12 14 16 18
Vcc-Power Supply Voltage (V)
20
AVERAGE SUPPLY CURRENT
v.s.
POWER-SUPPLY VOLTAGE
5
4
3
2
1
0
0 4 8 12 16
Vcc - Power-Supply Voltgae (V)
20
AVERAGE SUPPLY CURRENT
v.s.
AMBIENT TEMPERATRUE
7
6
5
4
3
2
-50 -25 0 25 50 75 100
TA - Ambient Temperatrure(℃)
VCT v.s. FREQUENCY
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
100 200
Frequency (KHz)
VCT(min)
VCT(max)
300
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AP2008.PDF ] | |
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