AS2916 Astec Power, AS2916 Datasheet

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AS2916

Manufacturer Part Number
AS2916
Description
Manufacturer
Astec Power
Datasheet

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Part Number:
AS2916
Manufacturer:
ASTEC
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Part Number:
AS2916
Manufacturer:
ASTEC
Quantity:
20 000
SEMICONDUCTOR
Features
Ordering Information
www.ptcc.com.tw
Pin Configuration –
Dual PWM Controller
Ultra low start-up current, less than
25µA
Main converter soft-start
Frequency randomizer for improved
EMI performance
Bulk detect circuitry
Remote ON/OFF control
Buffered ramp for slope compensation
Optional auxiliary converter primary
regulation
High main converter drive capability
Undervoltage lockout circuitry
Accurate reference
Standard temperature range extended
to 105°C
Circuit Type:
Temperature Range:
PWM Controller
B = 0 C to 105 C
CMPB
RAMP
SNSB
OUTB
OSC
REG
V CC
SS
1
2
3
4
5
6
7
8
16L PDIP (16N)
Top View
16
15
14
13
12
11
10
9
SNSA
CMPA
BOK
ON
WBL
PGND
OUTA
GND
AS2916
PWM Controller
AS2916 B 16D N
Description
The AS2916 is a dual, full featured, pulse width modulation controller.
The second controller is intended to run the auxiliary supply. Both con-
trollers share common oscillator and power up logic. Based on an
improved AS3842, the AS2916 provides additional features that reduce
component count and improve specifications in a wide range of power
supply designs. The added functionality also includes bulk voltage
sensing, overvoltage input and soft-start.
The PWM function is controlled by the current sense comparator 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 140 ns delay from the PWM comparators.
The AS2916 requires less than 25 µA of startup current. The under-
voltage lockout (UVLO) thresholds are nominally 13.5 V for turn-on and
7.5 V for turn-off. The oscillator discharge current is trimmed to provide
guaranteed duty cycle clamping. The AS2916 has a second low fre-
quency oscillator, which frequency modulates the operating frequency
of the PWM by 25%, thus reducing EMI emissions.
249
CMPB
RAMP
SNSB
OUTB
OSC
REG
V CC
SS
1
2
3
4
5
6
7
8
16L SOIC (16D)
Packaging Option:
Package Style:
T = Tubes
N = Tape and Reel (13" Reel Dia)
16D = 16 Pin, Plastic SOIC
16N = 16 Pin, Plastic DIP
16
15
14
13
12
11
10
9
SNSA
CMPA
BOK
ON
WBL
PGND
OUTA
GND

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AS2916 Summary of contents

Page 1

... The output stage is a high current totem pole output that sees only 140 ns delay from the PWM comparators. The AS2916 requires less than 25 µA of startup current. The under- voltage lockout (UVLO) thresholds are nominally 13.5 V for turn-on and 7 ...

Page 2

... AS2916 Functional Block Diagram V REG BOK 2V5 – – 2V5 SNSB CMPB 1V WBL OSC RT/CT RAMP x1 gm CMPA SNSA www.ptcc.com.tw (Bulk OK • AUX_ON (RUN) CM PWM 2R + – – SS PWM OSC V CC AUX_ON – PWM R 250 PWM Controller enable 5V Reg REG + – UVLO ...

Page 3

... µA current is sourced from the pin for hys- teresis. When the pin drops below 2.5 V the hysteresis is turned off and SS is pulled low,inhibiting the main output. The Auxiliary output is not tied to BOK and will run as long as there is sufficient bias voltage. 251 AS2916 resistor to limit the FET ...

Page 4

... AS2916 Pin Function Description Pin Number Function 12 CMPA is 13 SNSA 14 OUTA 15 GND 16 PGND Absolute Maximum Ratings Parameter Reference Current Output Current Supply Voltage Output Voltage Continuous Power Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 seconds) www.ptcc.com.tw Description This is the Auxiliary convertor error amplifier compensation pin or if secondary controller is desired, the Auxiliary control input pin ...

Page 5

... 25°C VREG = 4 25°C, V WBL = 18V T MIN MAX V OSC peak-to-peak V WBL = WBL = OSC = 680 , nF 25°C 2.2 nF WBL to GND Change in main oscillator freq. V WBL peak-to-peak V WBL = 0 WBL = 4.8 V 253 AS2916 Min. Typ. Max. Unit 4.90 5.00 5. 0.2 0.4 mV/°C 4 ...

Page 6

... AS2916 Electrical Characteristics Electrical characteristics are guaranteed over the full junction temperature range (0-105°). Ambient temperature must be derated based upon power dissipation and package thermal characteristics. The conditions are BOK = 680 , nF, and C WBL = 2.2 nF, unless otherwise specified. To override UVLO should be raised above UVLO HIGH prior to test ...

Page 7

... I SOURCE = 150 mA 15V 1.3 nF, 10 1.3 nF, 90% to 10% VCC = SINK = SINK = 150 mA I SOURCE = 10 mA 15V, V CMPA = SOURCE = 110 mA 15V, V CMPA = =350 pF, 10 350 pF, 90 25°C V BOK = 2 2.3 V 255 AS2916 Min. Typ. Max. Unit 0.1 0.4 V 1 ...

Page 8

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