AS2214 [ETC]
Primary Side PWM Controller; 初级侧PWM控制器
| 型号： | AS2214 |
| 厂家： | 
ETC |
| 描述： | Primary Side PWM Controller |
| 文件： | 总8页 (文件大小：57K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AS2214
Primary Side PWM Controller
Fea tures
Descrip tion
Low Startup Current
The AS2214 is a full featured, pulse width modulation
controller. Based on an improved AS3842, the AS2214
provides additional features that reduce component count
and improve specifications in a wide range of power supply
designs. The added functionality includes AC power and
bulkvoltagesensing,over-voltageinput,aswellastheability
to latch off or bounce through different fault conditions.
•
•
•
•
Bulk and AC sensing
Soft Start
Single-start or auto-restart
modes
Oscillator trimmed for precision
duty cycle clamp
•
The PWM function is controlled by the current sense com-
parator for normal current mode control and a second
comparator for voltage mode soft start. A buffered RAMP
signal is available for slope compensation without loading
the oscillator. The output stage is a high current totem pole
output that sees only 85 ns delay from the PWM comparator.
Standard temperature range
extended to 105°C
•
Remote on / off control
•
•
Buffered Ramp for slope
compensation
The AS2214 requires less than 10µA of startup current. The
undervoltagelockout(UVLO)thresholdsarenominally13.8V
for turn on and 8 V for turn off. A precision 2.5 V bandgap
reference serves as an input for the error amplifier. The
oscillator discharge current is trimmed to provide guaran-
teed duty cycle clamping.
Standard current mode control
•
Pin Config ura tion
—
Top view
14
13
VCC
1
2
3
4
5
6
7
OUT
GND
VREG
COMP
VFB
12 BOK
11 LEN
10 ACP
ISNS
SS
9
8
OV
RAMP
RT/CT
Ord ering Inform a tion
Package
Temperature Range
Order Code
14-Pin Plastic DIP
0 to 105° C
AS2214N
ASTEC Semiconductor
83
AS2214
Primary Side PWM Controller
Functiona l Block Dia g ra m
V
CC
AC
ACP
DETEC T
5V enable
5V Reg.
V
(LEN)
REG
LEN
V
6V
REG
50µA
UVLO
V
REG
BOK
(BULK_UV)
(CLR)
2V5
6µA
SS
3V95
SS LOGIC
OV
(RUN)
(OV)
2V5
ISNS
COMP
V
FB
2V5
CM PWM
2R
R
V
CC
1V
(PWM)
OUT
GND
SS PW M
(BLANK)
OSC
RT/CT
RAMP
x1
ASTEC Semiconductor
84
Primary Side PWM Controller
AS2214
AS2214 Soft Sta rt Log ic
ASTEC Semiconductor
85
AS2214
Primary Side PWM Controller
Pin Function Descrip tion
Pin Number
Function
VCC
Description
1
2
3
Positive supply voltage for the IC.
Output of 5V series regulator.
VREG
COMP
This pin is the error amplifier output. Typically used to provide loop compensation to
maintain VFB at 2.5 V.
4
5
6
VFB
ISNS
SS
Inverting input of the error amplifier. The non-inverting input is a trimmed 2.5 V
bandgap reference.
A voltage proportional to inductor current is connected to this pin. The PWM uses this
information to terminate the gate drive of the output.
This pin provides a 6µA current source to linearly charge an external capacitor. This pin
is compared to the RAMP pin in the soft start comparator, terminating output pulses when
RAMP goes above the SS voltage.
7
RAMP
This pin is a level-shifted and buffered oscillator signal used to provide slope compensa-
tion to the current sense signal. The pin also serves as the non-inverting input of the soft-
start comparator.
8
9
RT/CT
OV
Oscillator frequency and maximum duty cycle are set by connecting a resistor (RT) to
VREG and a capacitor (CT) to ground.
This pin latches SS low when pulled above 2.5 V. The latch can be reset by pulling
OV above 4 V then back to ground.
10
11
ACP
LEN
This pin detects the presence of AC signal and drives LEN high.
This pin must be high to enable starting. The pin can also clear all latches by going low
then high.
12
BOK
This pin monitors the bulk voltage through a resistor divider and, when BOK exceeds
2.5 V, provides a 50µA current source for hysteresis. When BOK drops below 2.5V, SS
is pulled low and the hysteresis current is turned off. Auto-restart after a brown-out is
possible.
13
14
GND
OUT
Circuit common ground.
This totem pole output is designed to directly drive a power MOSFET switch capable of
sourcing and sinking peak currents up to 1 A.
ASTEC Semiconductor
86
Primary Side PWM Controller
AS2214
Ab solute Ma xim um Ra ting s
Parameter
Symbol
IREF
IOUT
VCC
VOUT
PD
Rating
Unit
mA
A
Reference Current
200
Output Current
1
20
Supply Voltage
V
Output Voltage
20
V
Continuous Power Dissipation at 25° C
Junction Temperature
Storage Temperature Range
Lead Temperature, Soldering 10 Seconds
500
mW
°C
°C
°C
TJ
150
TSTG
TL
–65 to 150
300
StressesgreaterthanthoselistedunderABSOLUTEMAXIMUMRATINGSmaycausepermanentdamagetothedevice. Thisisastress
rating only and functional operation of the device at these or any other conditions above indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Recom m end ed Cond itions
Typ ica l Therm a l Resista nce
Parameter
Symbol
Rating
Unit
Package
θJA
θJC
Typical Derating
Supply Voltage
VCC
10 - 15
V
14L PDIP
85° C/W
40° C/W
11.7 mW/°C
Oscillator
FOSC
50 - 250
kHz
Electrica l Cha ra cteristics
Electrical Characteristics are guaranteed over full junction temperature range (0 to 105° C). Ambient temperature must be derated
based on power dissipation and package thermal characteristics. Unless otherwise specified, the conditions of test are VCC = 15 V;
BOK = 3 V; OV = 0V; RT = 680 Ω; CT = 10 nF. To override UVLO, VCC should be raised above 18 V prior to test.
Parameter
Symbol
Test Condition
Min
2.465
65
Typ
Max
Unit
Error Amplifier
Input Voltage
VFB
IBIAS
TJ = 25°C
2.500
-0.1
90
2.535
-1
V
µA
Input Bias Current
Voltage Gain
AVOL
2 ≤ VCOMP ≤ 4 V
dB
Transconductance
Unity Gain Bandwidth
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
Output Swing High
Output Swing Low
Gm
1
mA/mV
MHz
dB
GBW
PSRR
ICOMPL
ICOMPH
ICOMPH
ICOMPL
0.8
60
2
1.2
70
12 ≤ VCC ≤ 18 V
VFB = 2.7 V; VCOMP = 1.1 V
VFB = 2.3 V; VCOMP = 5 V
VFB = 2.3 V; RL = 15 Ω to GND
VFB = 2.7 V; RL = 15 Ω to VREG
6
mA
mA
V
0.5
5
1.0
5.5
0.7
1.1
V
ASTEC Semiconductor
87
AS2214
Primary Side PWM Controller
Electrica l Cha ra cteristics (cont’d )
Electrical Characteristics are guaranteed over full junction temperature range (0 to 105° C). Ambient temperature must be derated
based on power dissipation and package thermal characteristics. Unless otherwise specified, the conditions of test are VCC = 15 V;
BOK = 3 V; OV = 0V; RT = 680 Ω; CT = 10 nF. To override UVLO, VCC should be raised above 18 V prior to test.
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
5 V Regulator
Output Voltage
VREG
IREG = 1 mA, TJ= 25° C
12 ≤ VCC ≤ 18 V
4.90
5.00
5
5.10
15
V
mV
mV
mV/°C
V
Line Regulation
PSRR
Load Regulation
Temperature Stability
Total Output Variation
Long-Term Stability
Output Noise Voltage
Maximum Source Current
Oscillator
1≤ IREG ≤ 20mA
5
15
TCREG
0.2
0.4
5.15
25
Line, Load,Temperature
Over 1,000 hrs at 25°C
10 ≤ f ≤ 100kHz, TJ = 25°C
VREG = 4.8 V
4.85
5
mV
µV
VNOISE
IMAX
50
30
120
180
mA
Initial Accuracy
FOSC
TJ =25°C
108
120
0.2
132
1
kHz
%
Voltage Stability
12 ≤ VCC ≤ 18 V
Temperature Stability
Amplitude
TCF
VOSC
VH
T
MIN ≤ TJ ≤ TMAX
5
%
VRT/CT peak-to-peak
1.55
2.80
1.25
8.70
50
V
Upper Trip Point
Lower Trip Point
Discharge Current
Duty cycle Limit
V
VL
V
IDSC
7.50
46
9.50
54
mA
%
RT =680 Ω, CT =10nF, TJ =25°C
Over-Temperature Shutdown
Soft Start Comparator
SS Charge Current
SS Discharge Current
SS Lower Clamp
RAMP High Level
RAMP Low Level
RAMP Levels TC
TOT
140
°C
ISS
V
SS ≤ VRAMP
-4
2
-6
8
-10
µA
mA
V
IDsc SS
VSS Low
VRAMPH
VRAMPL
VSS = 1 V, VOV > 2.5V
0.6
2.15
0.6
-2
TJ =25°C
TJ =25°C
V
V
Note: RAMP wavefrom is the same as
the RT/CT wavefrom, but level shifted
down one diode drop
mV/°C
RAMP Sink Current
IRAMPL
IRAMPH
tPB
TJ =25°C
TJ =25°C
– 0.1
1
– 0.2
85
mA
mA
ns
RAMP Source Current
Propagation Delay to Output
150
ASTEC Semiconductor
88
Primary Side PWM Controller
AS2214
Electrica l Cha ra cteristics (cont’d )
Electrical Characteristics are guaranteed over full junction temperature range (0 to 105° C). Ambient temperature must be derated
based on power dissipation and package thermal characteristics. Unless otherwise specified, the conditions of test are VCC = 15 V;
BOK = 3 V; OV = 0V; RT = 680 Ω; CT = 10 nF. To override UVLO, VCC should be raised above 18 V prior to test.
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Housekeeping
BOK UV Threshold
BOK UV Hysteresis Current
BOK Input Bias Current
OV Threshold
VBOK UV
IHYST BOK
IOFF BOK
VOV
VREG = 5 V
2.500
42
2.537
50
2.575
58
V
µA
µA
V
VBOK = 2.6 V
VBOK = 2.4 V
0.1
1.0
2.50
3.80
1.10
-1
2.80
4.00
1.75
-0.2
3.10
4.50
2.20
1
OV Clear Threshold
OV Reset Threshold
OV Bias Current
VOVH
V
VOVL
V
IBIAS OV
VREG = 5 V, VOV ≤ OV Threshold
* For Vov > OV Reset Threshold,
see characteristic curve
µA
ACP Voltage
VACP
VACP
IACP = 10 µA
1.3
-1.2
-45
-50
3.6
V
V
ACP Voltage
IACP = -10 µA
LEN Charge Current
LEN Charge Current
ILEN
IACP = 10 µA; VLEN = 0 V
IACP = -10 µA; VLEN = 0 V
-30
-30
-65
-65
4.5
µA
µA
V
ILEN
Minimum Voltage for LEN
Functionality
VLEN MIN
LEN Logic Reset Voltage
VLEN
This level reflects one diode drop of
hysteresis from VLEN min
3.0
V
LEN Regeneration Current
LEN Clamp
ILENrgn
VLEN
-10
5.9
8
µA
V
IACP = 5 µA
5.2
6.6
LEN Bias Current
IBIAS LEN
VLEN = 5 V, IACP = 0 µA
µA
* For LEN input current over full
range, see characteristic curve.
Current Sense Comparator
Transfer Gain
AVISNS
VLS
-0.2 ≤ VISNS ≤ 0.8 V
VISNS = 0 V
2.85
1.00
3.00
1.50
1.08
70
3.15
1.20
V/V
V
ISNS Level Shift
Maximum Input Signal
Power Supply Rejection Ratio
Input Bias Current
VCOMP =+5 V
V
PSRR
IBIAS
tPB
12 ≤ VCC ≤ 18 V
dB
µA
ns
-1
-10
Propagation Delay to Output
85
150
ASTEC Semiconductor
89
AS2214
Primary Side PWM Controller
Electrica l Cha ra cteristics (cont’d )
Electrical Characteristics are guaranteed over full junction temperature range (0 to 105° C). Ambient temperature must be derated
based on power dissipation and package thermal characteristics. Unless otherwise specified, the conditions of test are VCC = 15 V;
BOK = 3 V; OV = 0V; RT = 680 Ω; CT = 10 nF. To override UVLO, VCC should be raised above 18 V prior to test.
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Under Voltage Lockout
Startup Threshold
VCC (ON)
12.5
7.3
14.0
8.0
15.8
8.5
V
V
Minimum Operating Voltage
after Trun-on
VCC (OFF)
Startup Current
ICC
ICC
VCC = 12 V; VACP = VLEN = 0 V
2
10
300
20
µA
µA
mA
V
Startup Current
VCC = 12V; IACP = 5 µA
225
12
Operating Supply Current
ICC
Maximum Operating Supply
Voltage
VCC Max
18
Output Impedance to GND in
UVLO State
ZOUT
VCC = 6 V
22.0
kΩ
Output
Output Low Level
Output Low Level
Output High Level
Output High Level
Rise Time
VOL
VOL
VOH
VOH
tR
ISINK = 20 mA
ISINK = 150 mA
ISOURCE = 20 mA
ISOURCE = 150 mA
CL = 1 nF
0.1
1.5
13.5
13
0.4
2.2
V
V
13
12
V
V
50
150
150
100
ns
ns
%
%
Fall Time
tF
CL = 1 nF
50
Maximum Duty Cycle
Minimum Duty Cycle
DMAX
DMIN
94
0
97
ASTEC reserves the right to make changes without further notice to any products described herein to improve reliability, function, or
design. ASTEC does not assume any liability arising out of the application or use of any product or circuit described herein; neither does
it convey any license under its patent rights or the rights of others. ASTEC products are not authorized for use as components in life
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ASTEC of any such intended end use whereupon ASTEC will determine availability and suitability of its products for the intended use.
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ASTEC Semiconductor
90
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