AP2011
Synchronous PWM with VFC Controller
Anachip Corp
www.anachip.com.tw Rev. 1.1 Apr 1, 2005
1/9
Features
- Single 10V to 40V Supply Application
- 1.25V + 2.0% Voltage Reference
- Virtual Frequency Control
TM
.
- Fast Transient Response.
- Synchronous Operation for High Efficiency
- Current Limit Function.
- Small Size with Minimum External Components
- Soft Start and Shutdown Functions
- Industrial Temperature Range
- Under Voltage Lockout Function
- SOP-14L Pb-Free Package
Applications
- Microprocessor Core Supply
- Low Cost Synchronous Applications
- Voltage Regulator Modules (VRM)
- Networking Power Supplies
- Sequenced Power Supplies
- Telecommunication Power Supplies.
Pin Assignments
SOP-14L
1
(Top View)
PVCC
OCSET
PHASE
PDRV
PGND
CAP
FB
AP2011
2
3
4
5
6
7
8
9
10
11
12
13
14
VCC
PGATE
VIN
NGATE
VREF
SGND
SS/SHDN
Ordering Information
AP2011 X X
Package
Packing
S: SOP-14L
Blank : Tube
A : Taping
General Description
The AP2011 is a low-cost, full featured,
synchronous voltage-mode controller designed for
use in single ended power supply applications
where efficiency is of primary concern.
Synchronous operation allows for the elimination of
heat sinks in many applications. The AP2011 is
ideal for implementing DC/DC converters needed to
power advanced microprocessors in low cost
systems or in distributed power applications where
efficiency is important. Internal level-shift, high-side
drive circuitry, and preset shoot-thru control, allows
the use of inexpensive 1P+1N-channel power
switches.
AP2011's features include temperature ompensated
voltage reference,
Virtual Frequency
Control
TM
method
to reduce external component count,
an internal virtual
frequency 200KHz oscillator, under-voltage lockout
protection, soft-start, shutdown function and current
sense comparator circuitry.
Virtual Frequency Control is a trademark of
PWRTEK, LLC.
Pin Descriptions
Pin Name
Pin
No.
Description
PGATE
1
Level shift-gate driver
VCC
2
Internal regulator voltage
PVCC 3
Power
VCC
PDRV
4
PMOS Gat driver
PGND 5
Power
Ground
NGATE 6
Low side driver output (N
MOSFET)
VIN 7
Chip
supply
voltage
CAP 8
Charge
pump
pin
SS/ SHDN
9
Soft start, a capacitor to
ground sets the slow start
time/set low for shutdown
function.
FB 10
Feedback
input
OCSET 11
Sets the converter
over-current trip point
SGND 12
Signal
Ground
PHASE 13
Input from the phase node
between the MOSFETs
VREF 14
Reference
voltage
AP2011
Synchronous PWM Controller
Anachip Corp
www.anachip.com.tw Rev. 1.1 Apr 1, 2005
2/9
Block Diagram
CROSS
CURRENT
CONTROL
DRVN
VIRTUAL FREQ
OSCILLATOR
200kHz
DRVP
R
Q
S
Q
S
QB R
+
-
-
+
+
-
+
-
+
-
VOLTAGE
REFERENCE
+
-
VCC
1.25V
UNDER
VOLTAGE
ERROR
COMP
0.3V
VCC
12ua
2ua
0.2V
0.9V
FB
GND
OCSET
PHASE
70uA
PVCC
PDRV
NGATE
AP2011 FUNCTIONAL BLOCK DIAGRAM
Virtual Frequency Control - Patent
Number 6,456,050.
INTERNAL
REGULATOR
8V
PGATE BIAS
VIN
CAP
PGATE
SS/SHDN
VREF
PGND
Absolute Maximum Ratings
Symbol
Parameter
Range.
Unit
V
IN
VCC to GND
0 to 42
V
V
PHASE
PHASE to GND
0 to 42
V
JC
Thermal Resistance Junction to Case
60
o
C/W
JA
Thermal Resistance Junction to Ambient
150
o
C/W
T
OP
Operating Temperature Range
-40 to +85
o
C
T
ST
Storage Temperature Range
-65 to +150
o
C
T
LEAD
Lead Temperature (Soldering) 10 Sec.
300
o
C
AP2011
Synchronous PWM Controller
Anachip Corp
www.anachip.com.tw Rev. 1.1 Apr 1, 2005
3/9
Electrical Characteristics
Unless specified: V
IN
=20V; GND = 0V;V
O
= 5V; T
J
= 25
o
C
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Power Supply
V
IN
Supply Voltage (Recommended)
10
-
40
V
I
IN
Supply
Current
-
8 10 mA
V
Load
Load
Regulation
0A
<
I
Load
< 3A
-
50
70
mV
V
LINE
Line
Regulation
V
IN
= 10V to 40V
I
Load
=1A
- 110
150
mV
V
CC
Internal
Regulator
Voltage
V
IN
=10V to 40V
8
8.5
9
V
V
IN
-V
CC
V
CC
Dropout Voltage
-
1.5
3.0
V
V
IN
-P
GATE
P-Gate to Source Voltage (Off)
V
IN
=10V
V
IN
=40V
-0.4 -0.2 -
V
Error Comparator
A
OL
Gain
(A
OL
)
-
60
-
dB
I
B
Input
Bias
- 0.2 1 uA
Oscillator
DC
MAX
Oscillator Max Duty Cycle
80 85 - %
Protection
T
DEAD
Dead
Time
100 150 250 nS
I
OCSET
Over Current Set Isink
V
IN
1.5V <
V
OCSET
< V
IN
- 70 - uA
Reference
Reference Voltage
1.225
1.25
1.275
V
V
REF
Accuracy
0
o
C to 70
o
C
-2 - +
2 %
Soft Start
I
SSC
Charge
Current
V
SS
= 1.5V
8.0
10
12
uA
I
SSD
Discharge
Current
V
SS
= 1.5V
1.3
2
2.7
uA
Under voltage lockout (UVLO)
V
UT
Upper Threshold Voltage (V
CC
) -
6.8
-
V
V
LWT
Lower Threshold Voltage (V
CC
) -
6.5
-
V
V
HT
Hysteresis
(V
CC
)
T
A
= 25C
- 300 - mV
Note 1. Specification refers to Typical Application Circuit.
Note 2. This device is ESD sensitive. Use of standard ESD handling precautions is required.
Note 3. Abnormal condition; Ex: over-current, output over-voltage, under-voltage lockout, soft-start disappear.
Note 4. V
CC
pin should not be used to externally source current. It is not short protected.
AP2011
Synchronous PWM Controller
Anachip Corp
www.anachip.com.tw Rev. 1.1 Apr 1, 2005
4/9
Typical Application Circuit
VIN
OCSET
VCC
PVCC
CAP
PGND
FB
NGATE
PHASE
PDRV
PGATE
SS/SHDN
Vout=5V
Lout
22u
R1
3K
R2
1K
Cin
470u
(50V)
VIN=10V~28V(10V~40V)
R4
6.8K
SGND
VREF
C1
100n
C2
1u(50V)
C3
300n
Q2
AF9410
(AF4410)
(9985)
Q1
AF9435
(AF4835)
(9563)
D1
Optional
D2
C4
0.1u
10n
(50V)
C5
47n
Cout
680u
10n
47n(50V)
Optional
R3
6.8 ohm
Cboost
C6
0.1u (50V)
V
OUT
= V
FB
(1
+
R2
R1
)
V
FB
= 1.25V
R2 = 820 ~ 5.1K
Typical Performance Characteristics
PMOS: AF4835; NMOS: AF4410
Efficiency (Vout=5V)
80
85
90
95
0
1
2
3
4
5
Iout (A)
E
f
f
i
c
i
enc
y
(
%
)
Vin=12V
Vin=30V
Vin=20V
PMOS: AP9563; NMOS: AP9985
Efficiency (Vout=5V)
70
75
80
85
0
1
2
3
4
5
Iout (A)
Ef
f
i
ci
e
n
c
y (%
)
Vin=40V
AP2011
Synchronous PWM Controller
Anachip Corp
www.anachip.com.tw Rev. 1.1 Apr 1, 2005
5/9
Typical Performance Characteristics
Load Regulation (Vin=12V; Vout=5V)
0
0.2
0.4
0.6
0.8
1
1.2
0
1
2
3
4
5
Iout (A)
Loa
d Reg
u
la
t
i
on
(
%
)
Line Regulation (Vout=5V)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0
10
20
30
40
Vin (V)
L
i
ne
Re
gu
l
a
t
i
o
n
(
%
)
Vin v.s. Icc (No external component)
8.23
8.24
8.25
8.26
8.27
8.28
8.29
8.3
8.31
10
15
20
25
30
35
40
Vin (V)
Ic
c
(
m
A
)
Vin v.s. Icc (Operation current)
0
4
8
12
16
20
10
15
20
25
30
35
40
Vin (V)
Ic
c
(
m
A
)
Internal Regulator Voltage
(Vin=12V; Vout=5V)
8.1
8.15
8.2
8.25
8.3
8.35
8.4
8.45
8.5
8.55
-25
0
25
50
75
100
Junction Temperature (
o
C)
Vcc (V)
R4 v.s. Current limit
(Vin=12V; Vout=5V)
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
2
3
4
5
6
7
8
9
R4 (K)
Cur
r
e
n
t
lim
it
(
A
)
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