AP2014-ASA [ANACHIP]
Synchronous PWM Controller; 同步PWM控制器
| 型号： | AP2014-ASA |
| 厂家： | 
ANACHIP CORP |
| 描述： | Synchronous PWM Controller |
| 文件： | 总12页 (文件大小：234K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP2014/A
Synchronous PWM Controller
Features
General Description
- Synchronous Controller in 8-Pin Package
- Operating with single 5V or 12V supply voltage
- Internal 200KHz Oscillator (400KHz for AP2014A)
- Soft-Start Function
The AP2014 controller IC is designed to provide a
low cost synchronous Buck regulator for on-board
DC to DC converter applications. With the migration
of today’s ASIC products requiring low supply
voltages such as 1.8V and lower, together with
currents in excess of 3A, traditional linear regulators
are simply too lossy to be used when input supply is
5V or even in some cases with 3.3V input supply.
The AP2014 together with dual N-channel
MOSFETs such as AF9410, provide a low cost
solution for such applications. This device features
an internal 200KHz oscillator (400KHz for "A"
version), under-voltage lockout for both Vcc and Vc
supplies, an external programmable soft-start
function as well as output under-voltage detection
that latches off the device when an output short is
detected.
- Fixed Frequency Voltage Mode
- 500mA Peak Output Drive Capability
- Protects the output when control FET is shorted
- SOP-8L/PDIP-8L Pb-Free package
Applications
- Graphic Card
- Hard Disk Drive
- DDR memory source sink Vtt application
- Low cost on-board DC to DC such as 5V to 3.3V,
2.5V or 1.8V
Pin Assignments
Pin Descriptions
Pin
Name
Pin
No.
Description
This pin is connected directly to the output of the
switching regulator via resistor divider to provide
feedback to the Error amplifier.
(Top View)
FB
1
This pin provides biasing for the internal blocks of
the IC as well as power for the low side driver. A
minimum of 1uF, high frequency capacitor must be
connected from this pin to ground to provide peak
drive current capability.
1
2
3
4
8
SS
FB
Vcc
Vcc
LDrv
GND
HDrv
2
3
4
5
Comp
Vc
7
6
AP2014/A
LDrv
GND
Output driver for the synchronous power MOSFET.
This pin serves as the ground pin and must be
connected directly to the ground plane. A high
frequency capacitor (0.1 to 1uF) must be connected
from V5 and V12 pins to this pin for noise free
operation.
HDrv
5
SOP-8L/PDIP-8L
Output driver for the high side power MOSFET.
This pin is connected to a voltage that must be at
least 4V higher than the bus voltage of the switcher
(assuming 5V threshold MOSFET) and powers the
high side output driver. A minimum of 1uF, high
frequency capacitor must be connected from this
pin to ground to provide peak drive current
capability.
Vc
Comp
SS
6
7
8
Compensation pin of the error amplifier. An external
resistor and capacitor network is typically connected
from this pin to ground to provide loop
compensation.
This pin provides soft-start for the switching
regulator. An internal current source charges an
external capacitor that is connected from this pin to
ground which ramps up the output of the switching
regulator, preventing it from overshooting as well as
limiting the input current. The converter can be
shutdown by pulling this pin below 0.5V.
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. 1.2 Nov 29, 2005
1/12
AP2014/A
Synchronous PWM Controller
Ordering Information
X
X
AP2014/A
Package
Packing
S: SOP-8L
N: PDIP-8L
Blank : Tube
A : Taping
Block Diagram
Vc
6
3V
FbLo Comp
-
20uA
0.5V
+
POR
SS
8
64uA
Max
POR
Ct
Oscillator
5
HDrv
1.25V
25K
S
R
Error Comp
Error Amp
+
+
Q
2
3
Vcc
-
25K
Reset Dom
Fb
1
7
-
LDrv
Comp
Bias
Generator
3V
Vcc
1.25V
0.2V
0.2V
+
POR
-
4.0V
Vc
+
-
3.5V
4
GND
Absolute Maximum Ratings
Symbol
VCC
VC
Parameter
Vcc Supply Voltage
Range.
Unit
V
20
32
Vc Supply Voltage (not rated for inductive load)
Storage Temperature Range
V
oC
oC
oC/W
oC/W
TST
-65 to 150
0 to 125
90
TJ
Operating Junction Temperature Range
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
șJC
șJA
250
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
2/12
AP2014/A
Synchronous PWM Controller
Electrical Characteristics
Unless otherwise specified, these specifications apply over VCC=5V, VC=12V and TA=0 to 70°C. Typical values refer to TA =25°C. Low duty
cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Reference Voltage
AP2014
AP2014A
5 < Vcc < 12
1.225
0.784
-
1.25
0.8
1.275
0.816
0.35
VFB
FB Voltage
V
LREG
FB Voltage Line Regulation
0.2
%
UVLO
UVLO Threshold - VCC
UVLO Hysteresis - VCC
UVLO Threshold - VC
UVLO Hysteresis - VC
4.0
-
4.2
0.25
3.3
4.4
-
V
V
V
V
UVLO VCC
UVLO VC
Supply Ramping Up
Supply Ramping Up
3.1
-
3.5
-
0.2
FB Ramping Down
(AP2014)
0.4
0.6
0.8
V
UVLO Threshold - FB
UVLO Hysteresis - FB
UVLO FB
FB Ramping Down
(AP2014A)
0.3
-
0.4
0.1
0.5
-
V
V
Supply Current
Freq=200KHz,
CL=1500pF
Freq=200KHz,
CL=1500pF
SS=0V
Operation ICC VCC Operation Supply Current
Operation IC VC Operation Supply Current
-
-
7
7
10
10
mA
mA
ICCQ
ICQ
Soft-Start Section
VCC Static Supply Current
-
-
3.3
1
6
4.5
mA
mA
VC Static Supply Current
SS=0V
SSIB
Error Amp
IFB1
Charge Current
SS=0V
10
20
30
µA
FB Voltage Input Bias Current SS=3V, FB=1V
FB Voltage Input Bias Current SS=0V, FB=1V
Transconductance
-
-
-0.1
-64
-
-
µA
µA
IFB2
gm
450
600
750
µmho
Oscillator
AP2014
170
340
200
400
1.25
230
460
KHz
KHz
V
Freq
Frequency
AP2014A
Ramp-Amplitude Voltage
VRAMP
Output Drivers
1.225
1.275
Tr
Tf
Rise Time
Fall Time
CL =1500pF
CL =1500pF
-
-
50
50
150
90
0
100
100
250
95
ns
ns
ns
%
TDB
TON
TOFF
Dead Band Time
Max Duty Cycle
Min Duty Cycle
50
85
0
FB=1V, Freq=200KHz
FB=1.5V
-
%
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
3/12
AP2014/A
Synchronous PWM Controller
Typical Application Circuit
(1)
VIN=5V
Vc=12V
C8
C11
0.1u
470u
C3
1u
R3
8.2
C4
0.1u
R1
820
U1
FB
1
2
3
4
8
7
6
5
SS
Q1
AF9410N
R2
3.3K
Vcc Comp
Vc
GND HDrv
LDrv
L1
5.6u/9.0
Vout +1.5V/7.0A
C5
C6
10nF
AP2014
0.47u
Q2
AF9410N
C12
C13
C17
0.1u
R6
22k
C20
100p
470u
470u
(2)
VIN=12V
D2
1N4148
D1
C1
0.1uF
C8
C11
0.1u
470u
1N4148
C4
0.1u
R1
820
R3
8.2
U1
FB
1
2
3
4
8
7
6
5
SS
R2
3.3K
C3
100u
Q1
AF9410N
Vcc Comp
Vc
LDrv
GND HDrv
L1
5.6u/9A
Vout +1.5V/7.0A
AP2014
C6
10nF
C5
0.47u
Q2
AF9410N
C12
C13
C17
0.1u
R6
6.8k
C20
100p
Option
470u 470u
Single Supply 12V Input
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
4/12
AP2014/A
Synchronous PWM Controller
Typical Application Circuit (Continued)
(3)
VIN=12V
D2
1N4148
C1
0.1uF
D1
C8
C11
0.1u
470u
1N4148
C4
0.1u
R1
10K
R3
8.2
U1
1
2
3
4
8
7
6
5
FB
Vcc
LDrv
SS
Comp
Vc
R2
3K
C3
100u
Q1
AF4910N-1
GND HDrv
L1
10uH/6A
Vout +5V/5.0A
AP2014
C6
10nF
C5
0.47u
Q2
AF4910N-2
C13
C17
0.1u
R6
39k
C20
100p
470u
Single Supply 12V Input
(4)
VIN=24V
RZD
1.2K
C1
0.1uF
D1
C8
C11
0.1u
470u
1N4148
D2
1N4148
C4
0.1u
R1
10K
R3
8.2
U1
FB
1
2
3
4
8
7
6
5
SS
R2
3.3K
Q1-1
AF4928N-1
Vcc Comp
Vc
LDrv
GND HDrv
R3
8.2
L1
10uH/6A
Vout +5V/4.0A
AP2014
C6
10nF
ZD
6.2V
C3
100u
C5
0.47u
Q1-2
AF4928N-2
C13
470u
C17
0.1u
R6
47k
C20
100p
IZD(Њ15mA)=(VIN-VD2-VZD)/RZD
Single Supply 24V Input
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
5/12
AP2014/A
Synchronous PWM Controller
Typical Application Circuit (Continued)
(5) Dual Supply, 5V Bus and 12V Bias Input
5V
L1
12V
1uH
+
+
C4
47uF
C3
100uF
C1
0.1uF
C1
1uF
1.8V/1A
AP1187
Vcc
Vc
+
C5
47uF
2.5V/2A
Q1
AF9410
HDrv
L2
AP2014
10uH
Q2
AF9410
+
C6
220uF
C8
10nF
Comp
SS
LDrv
R1
3.3K
Fb
R3
1K
GND
R2
1K
C7
0.1uF
+
C10
1uF
C9
0.1uF
C11
Vcc
Vc
Q3
AF9410
HDrv
L3
AP2014
3.3V/1.8A
10uH
+
C14
10nF
LDrv
Comp
Q4
AF9410
C12
220uF
R4
3.3K
Fb
R6
1.65K
SS GND
R5
1K
C13
0.1uF
Dual Supply, 5V Bus and 12V Bias Input
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
6/12
AP2014/A
Synchronous PWM Controller
Typical Performance Characteristics
Efficiency v.s. Iout
Load Regulation
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
2.0%
1.8%
1.6%
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0
Iout(A)
0.0 0.5 1.0 3.0 5.0 8.0 10.0 12.0 15.0
Iout(A)
Line Regulation
Line Regulation
1.260
2.530
2.525
2.520
2.515
2.510
2.505
2.500
1.255
1.250
1.245
1.240
4.5 5.0 7.0 9.0 11.0 12.0 15.0
Vin(V)
4.5
5.0
7.0
Vin(V)
9.0 11.0 12.0 15.0
Frequency v.s. Temperature
Frequency v.s. Vin
240.0
230.0
220.0
210.0
200.0
190.0
180.0
170.0
160.0
150.0
210.0
205.0
200.0
195.0
190.0
185.0
180.0
175.0
4.5 5.0 7.0 9.0 11.0 12.0 15.0
Vin(V)
-40 -20
0
25 50 75 100 125
Temperature (oC)
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
7/12
AP2014/A
Synchronous PWM Controller
Typical Performance Characteristics (Continued)
Icc and Iccq v.s. Vin
Ic and Icq v.s. Vin
16.00
14.00
12.00
10.00
8.00
15.00
13.00
11.00
9.00
Icc(mA)
Ic(mA)
Iccq(mA)
Icq(mA)
7.00
6.00
4.00
5.00
2.00
3.00
4.5
5
7
9
11
12
15
4.5
5
7
9
Vin(V)
11
12
15
Vin(V)
Icc and Ic v.s. Temperature
Vfb v.s. Temperature
10.0
1.30
1.28
1.26
1.24
1.22
1.20
Icc(mA)
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
Ic(mA)
-40 -20
0
25
50
75 100 125
-40 -20
0
25 50 75 100 125
Temperature (oC)
Temperature (oC)
AP2014 Ic and Icc vs Vc
AP2014A Ic and Icc vs Vc
20.0
18.0
16.0
14.0
12.0
10.0
8.0
21.0
19.0
17.0
15.0
13.0
11.0
9.0
Ic(mA)
Ic(mA)
Icc(mA)
Icc(mA)
6.0
7.0
4.0
5.0
2.0
3.0
6
8
10 12 14 16 18 20 22 24
Vc(V)
6
8
10 12 14 16 18 20 22 24
Vc(V)
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
8/12
AP2014/A
Synchronous PWM Controller
Typical Performance Characteristics (Continued)
Vout Ripple
Vcc=5V; Vc=12V; Vout=2.5V
Iout=0.5A, Vripple=30.8mV
Vout Ripple
Vcc=5V; Vc=12V; Vout=2.5V
Iout=5A, Vripple=33.2mV
Dead time v.s. Iout
Vcc=5V, Vc=12V, Vout=2.5V, Iout=0.5A, Temp=28oC
Dead time = 150ns Dead time = 150ns
Phase
Highside GATE
Lowside GATE
Dead time v.s. Iout
Vcc=5V, Vc=12V, Vout=2.5V, Iout=5A , Temp=28oC
Dead time = 160ns Dead time = 150ns
Phase
Highside GATE
Lowside GATE
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
9/12
AP2014/A
Synchronous PWM Controller
Function Descriptions
Introduction
Short-Circuit Protection
The AP2014 is a fixed frequency, voltage mode
synchronous controller and consists of a precision
reference voltage, an error amplifier, an internal
oscillator, a PWM comparator, 0.5A peak gate driver,
soft-start and shutdown circuits (see Block
Diagram).
The outputs are protected against the short circuit.
The AP2014 protects the circuit for shorted output
by sensing the output voltage (through the external
resistor divider). The AP2014 shuts down the PWM
signals, when the output voltage drops below 0.6V
(0.4V for AP2014A).
The output voltage of the synchronous converter is
set and controlled by the output of the error amplifier;
this is the amplified error signal from the sensed
output voltage and the reference voltage.
The AP2014 also protects the output from
over-voltaging when the control FET is shorted.
This is done by turning on the sync FET with the
maximum duty cycle.
This voltage is compared to a fixed frequency linear
sawtooth ramp and generates fixed frequency
pulses of variable duty-cycle, which drives the two
N-channel external MOSFETs.The timing of the IC
is provided through an internal oscillator circuit
which uses on-chip capacitor to set the oscillation
frequency to 200 KHz (400 KHz for “A” version).
Under-Voltage Lockout
The under-voltage lockout circuit assures that the
MOSFET driver outputs remain in the off state
whenever the supply voltage drops below set
parameters. Lockout occurs if VC and VCC fall below
3.3V and 4.2V respectively. Normal operation
resumes once VC and VCC rise above the set values.
Soft-Start
IC Quiescent Power Dissipation
The AP2014 has a programmable soft-start to
control the output voltage rise and limit the current
surge at the start-up. To ensure correct start-up, the
soft-start sequence initiates when the VC and VCC
rise above their threshold (3.3V and 4.2V
respectively) and generates the Power On Reset
(POR) signal. Soft-start function operates by
sourcing an internal current to charge an external
capacitor to about 3V. Initially, the soft-start function
clamps the E/A’s output of the PWM converter. As
the charging voltage of the external capacitor ramps
up, the PWM signals increase from zero to the point
the feedback loop takes control.
Power dissipation for IC controller is a function of
applied voltage, gate driver loads and switching
frequency. The IC's maximum power dissipation
occurs when the IC operating with single 12V supply
voltage (Vcc=12V and Vc#24V) at 400KHz switching
frequency and maximum gate loads.
Page 8 show voltage vs. current, when the
gate drivers loaded with 1500pF capacitors. The IC's
power dissipation results to an excessive
temperature rise. This should be considered when
using AP2014A for such application.
Marking Information
(Top View)
5
8
Logo
ID code: internal
AP2014 X
YY WW X
Part No.
AP2014 : 200KHz (OSC)
AP2014A : 400KHz (OSC)
Xth week: 01~52
Year: "01" =2001
"02" =2002
1
4
SOP-8L/PDIP-8L
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
10/12
AP2014/A
Synchronous PWM Controller
Package Information
Package Type: SOP-8L
L
VIEW "A"
D
0.015x45
VIEW "A"
7 (4X)
7 (4X)
e
B
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
1.40
0.10
1.30
0.33
0.19
4.80
3.70
-
Nom.
1.60
-
Max.
1.75
0.25
1.50
0.51
0.25
5.30
4.10
-
Min.
Nom.
0.063
-
Max.
A
A1
A2
B
0.055
0.040
0.051
0.013
0.0075
0.189
0.146
-
0.069
0.100
0.059
0.020
0.010
0.209
0.161
-
1.45
0.41
0.20
5.05
3.90
1.27
5.99
0.71
-
0.057
0.016
0.008
0.199
0.154
0.050
0.236
0.028
-
C
D
E
e
H
L
5.79
0.38
-
0O
6.20
1.27
0.10
8O
0.228
0.015
-
0O
0.244
0.050
0.004
8O
y
-
-
T
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
11/12
AP2014/A
Synchronous PWM Controller
Package Information (Continued)
Package Type: PDIP-8L
D
E-PIN O0.118 inch
E
(4X)
15
PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
C
7
(4X)
eB
B
B1
e
S
B2
Dimensions in millimeters
Dimensions in inches
Nom.
-
Symbol
Min.
-
Nom.
-
Max.
5.33
-
Min.
-
Max.
0.210
A
A1
A2
B
0.38
3.1
-
0.015
0.122
0.014
0.055
0.032
0.008
0.355
0.300
0.242
-
-
-
3.30
0.46
1.52
0.99
0.25
9.27
7.94
6.35
2.54
3.3
3.5
0.130
0.018
0.060
0.039
0.010
0.365
0.313
0.250
0.100
0.130
0.350
0.033
0.138
0.022
0.065
0.045
0.014
0.375
0.325
0.258
-
0.36
1.4
0.56
1.65
1.14
0.36
9.53
8.26
6.55
-
B1
B2
C
0.81
0.20
9.02
7.62
6.15
-
D
E
E1
e
L
2.92
8.38
0.71
3.81
9.70
0.97
0.115
0.330
0.028
0.150
0.382
0.038
eB
S
8.89
0.84
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
12/12
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