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PDF AS2214 Data sheet ( Hoja de datos )
| Número de pieza | AS2214 | |
| Descripción | Primary Side PWM Controller | |
| Fabricantes | ETC | |
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AS2214
Primary Side PWM Controller
Features
• Low Startup Current
• Bulk and AC sensing
• Soft Start
• Single-start or auto-restart
modes
• Oscillator trimmed for precision
duty cycle clamp
• Standard temperature range
extended to 105°C
• Remote on / off control
• Buffered Ramp for slope
compensation
• Standard current mode control
Description
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
bulk voltage sensing, over-voltage input, as well as the ability
to latch off or bounce through different fault conditions.
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.
The AS2214 requires less than 10µA of startup current. The
undervoltage lockout (UVLO) thresholds are nominally 13.8V
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.
Pin Configuration — Top view
VCC 1
VREG 2
COMP 3
VFB 4
ISNS 5
SS 6
RAMP 7
14 OUT
13 GND
12 BOK
11 LEN
10 ACP
9 OV
8 RT/CT
Ordering Information
Package
14-Pin Plastic DIP
ASTEC Semiconductor
Temperature Range
0 to 105° C
83
Order Code
AS2214N
1 page  
Primary Side PWM Controller
AS2214
Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Reference Current
IREF 200 mA
Output Current
IOUT 1 A
Supply Voltage
VCC 20 V
Output Voltage
Continuous Power Dissipation at 25° C
Junction Temperature
VOUT
PD
TJ
20 V
500 mW
150 °C
Storage Temperature Range
TSTG
– 65 to 150
°C
Lead Temperature, Soldering 10 Seconds
TL 300 °C
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress
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.
Recommended Conditions
Parameter
Supply Voltage
Oscillator
Symbol
VCC
FOSC
Rating
10 - 15
50 - 250
Unit
V
kHz
Typical Thermal Resistance
Package
14L PDIP
θJA
85° C/W
θJC Typical Derating
40° C/W 11.7 mW/°C
Electrical Characteristics
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
Error Amplifier
Input Voltage
Input Bias Current
Voltage Gain
Transconductance
Unity Gain Bandwidth
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
Output Swing High
Output Swing Low
VFB
IBIAS
AVOL
Gm
GBW
PSRR
ICOMPL
ICOMPH
ICOMPH
ICOMPL
TJ = 25°C
2 ≤ VCOMP ≤ 4 V
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
2.465
65
0.8
60
2
0.5
5
2.500
-0.1
90
1
1.2
70
6
1.0
5.5
0.7
2.535
-1
1.1
V
µA
dB
mA/mV
MHz
dB
mA
mA
V
V
ASTEC Semiconductor
87
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AS2214.PDF ] | |
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