AN8086 [PANASONIC]
Low Voltage Operation IC for DC-DC Converter; 低工作电压IC的DC-DC转换器
| 型号： | AN8086 |
| 厂家： | 
PANASONIC |
| 描述： | Low Voltage Operation IC for DC-DC Converter |
| 文件： | 总3页 (文件大小：46K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICs for CD/CD-ROM Player
AN8086S
Low Voltage Operation IC for DC-DC Converter
Unit : mm
■ Overview
The AN8086S is an IC for controlling a DC-DC converter
suitable for the switching power supply of various
portable equipment. It can operate with input voltage
1.1V or more. The AN8086S is based on AN8083S with
the output voltage in the secondary side changed to 3.6V.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
■ Features
•
•
•
•
•
•
Operatable with low voltage input (PVCC>1.1V)
Decreased voltage detection circuit built-in
Short-circuit protection feature built-in
Provided with reset output
Synchronizable with outside clock
Low consumption current in stand-by mode
0.3
4.2±0.3
6.5±0.3
16-lead SOP package (SOP016-P-0225A)
■ Block Diagram
RESET VCC EMP
15 16 13
VSEN
14
START CT
VREF
12
10
7
2.2V
VREF
0.85V
0.25V
+
–
+ –
Triangular
Wave
Starter
CLK
PVCC
9
8
2.7V→ 2.5V
Starter SW
4.8V
Early Value Set.
2.0V
–
+
Power
Off
+
–
POWER
GND
11
–
+
+
+
–
Switching
Circuit
30kΩ
0.725V
6
63kΩ
1
2
3
4
5
IN
FB
SPRO
DED
OUT
ICs for CD/CD-ROM Player
AN8086S
■ Absolute Maximum Ratings (Ta=25˚C)
Parameter
Symbol
Rating
14.4
Unit
V
VCC
PVCC
PD
Supply Voltage
14.4
Power Dissipation
380
mW
˚C
Operating Ambient Temperature
Storage Temperature
Topr
Tstg
–20 ~ +75
–55 ~ +125
˚C
■ Recommended Operating Range (Ta=25˚C)
Parameter
Symbol
VCC
Range
3.6V ~ 12V
1.1V ~ 12V
Operating Supply Voltage Range
PVCC
■ Electrical Characteristics (Ta=25˚C)
Parameter
Symbol
IPVCC
IPVCC
Condition
VCC=0V, PVCC=3V
VCC=3.1V, PVCC=3V
min.
typ.
max.
Unit
µA
Power VCC Stand-by Mode Supply Current
Power VCC No Load Supply Current
Output Voltage
2
3
1.2
3.6
mA
V
VO
Reset Output Threshold Voltage
Decreased Voltage Detection Threshold Voltage
Short-Circuit Protection Operating Voltage
Short-Circuit Protection Operating Voltage
Triangular oscillation Frequency in Normal Operation
VTH (RESET)
VTH (VSEN)
VO (SPRO)
VO (SPRO)
fOSC1
V
VTH × 0.85 VTH
×
9
VTH × 0.95
2.3
2.1
1.35
1.7
2.2
V
VIN=0V, VPOWER=2V
VIN=1V, VPOWER=0V
RREF=33kΩ, CT=330pF
2.1
V
3.2
V
60
70
80
kHz
R
REF=33kΩ, CT=330pF
Triangular oscillation Frequency at Start
fOSC2
80
100
120
kHz
VCC=1.9V, PVCC=3V
IO=–20mA, VCT=0V
IO=20mA, VCT=1V
Output Voltage
Output Voltage
VOH (OUT)
VOL (OUT)
1.2
1.6
0.4
V
V
Note) Unless otherwise specified, VCC =4.8V, PVCC=3V
■ Application Circuit Example
3.6V
330pF
VREF
33kΩ
VCC
RESET
EMP
16 13
CT
START
VSENSE
15
14
10
7
12
2.2V
VREF
0.85V
0.25V
CLK
+
–
–
+
Triangular
Wave
Starter
9
2.7V→ 2.5V
PVCC
Starter SW
4.8V
8
Early Value Set.
POWER
2.0V
–
Power
OFF
+
+
11
–
–25µA
–
+
+
+
Swiching
Circuit
–
30kΩ
0.725V
GND
6
0.01µF
100Ω
63kΩ
1
2
3
4
5
SPRO
47µF
DED
OUT
IN
FB
+
0.01µF
33kΩ
0.01µF
ICs for CD/CD-ROM Player
AN8086S
■ Pin Description
Pin No.
Symbol
Description
• Input pin for error amplifier
• Threshold voltage ; 0.7V
1
2
IN
FB
• Output pin for error amplifier
• Short-circuit protection input pin
If output of error amplifier does not become “L” when t = CVth/ISPRO output of IC is not
3
4
SPRO
DED
switched.
I
SPRO =25µA
Vth = 0.9V
• Dead time control input
Maximum duty ratio set to 85%.
• Switching output pin
5
6
OUT
GND
Output current ; IO=20mA (max.)
• GND pin
• Triangular oscillating capacitor pin
CV
CV
I (Charged)
T1 =
T2 =
I (Discharged) =52µA
I (Charged) =30µA
V = 0.58V
I (Discharged)
7
CT
V
1
f =
T1 + T2
In normal operation
T1
T2
• DC voltage input pin
Operates with 1.1V or more.
8
9
PVCC
CLK
• Clock input
· It is used to synchronize triangular oscillation with clock input and operates at rise edge of
clock.
· The threshold level is TTL level.
· It is open when not used.
• Start pin
10
11
START
· Starts switching of starter (start at “L”)
· Threshold voltage, PVCC – 0.9V
• Power ON/OFF pin
Output ON/OFF switching pin (Output is off at “L.”)
POWER
• Reference voltage pin
· 1.25V output
· Charged and discharged current of triangular oscillation is determined by external R.
12
VREF
VREF – 0.7
I (Charged) =
RREF +1kΩ
I (Discharged)=1.40 × I (Charged)
• Decreased voltage detection output pin
13
14
EMP
VSEN
“H” when detected by open collector output form
• Decreased voltage detection input pin
· Threshold voltage ; 2.2V
• Reset output pin
15
16
Reset
VCC
· “H” when VCC becomes VO × 0.9V or more
· Open collector output form
• DC voltage input pin
Operates with 3.6V or more.
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