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AS2916
Functional Block Diagram
VREG 50A 5V enable 5V Reg
PWM Controller
VCC
REG
BOK 2V5
+ -
(Bulk OK)
S
Q
+
R
*
UVLO
-
ON 2V5 SNSB
VREG
+ -
(RUN)
AUX_ON 6A SS
CMPB 2R
+ -
CM PWM
1V WBL OSC
R (PWM)
+ -
VCC OUTB
SS PWM RT/CT OSC (Blank) GND
RAMP
x1
VCC (Blank)
VCC gm (PWM) OUTA
CMPA
x1 2R 1V R
AUX_ON
- +
GND CM PWM
SNSA
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PWM Controller
Pin Function Description
Pin Number 1 Function OUTB Description
AS2916
This is the gate drive output for the Main FET. The totem pole output has equivalent of an extra 10 resistor to limit the FET turn on speed and a pull down resistor to ensure the FET gate is never open. No external circuitry except for the FET is expected on this pin. The largest FET expected to be driven is IRFBC40. If a larger power FET is used, a buffer might be required. Positive supply for the IC. Absolute maximum rating is 20 V. The running voltage shall be provided by the Auxiliary conver tor. Output of 5 V series regulator. This is the Main convertor current sense pin. An external RC filter from the Main power FET and slope compensation resistor from the RAMP pin is all the expected external circuitry. This is the Main output control pin. An opto isolated control signal from the secondary side error amplifier is buffered and connected to the invert pin of the main output current mode comparator. A pull-up current of 1 mA is provided so the only external circuitry expected is a common emitter opto-isolator. This pin provides a 6 A current source to linearly charge an external capacitor. This spin is compared to the RAMP pin in the soft start comparator, terminating output pulses when RAMP goes above the SS voltage. While this pin is held low, the main output is inhibited. This pin is a level-shifted and buffered oscillator waveform, used to provide slope compensation for the Main and Auxiliary converters. The pin also serves as the non-inverting input of the soft-start comparator. Oscillator frequency and maximum duty cycle are set by connecting the resistor (RT) to VREG and a capacitor (CT) to ground. Provides an FM modulation of the oscillator, approximately 25% deviation frequency, at a modulation rate set by an external cap at WBL. Shorting to GND eliminates modulation. This pin is used to remotely turn the main convertor ON/OFF either for normal user application or for protection. Bulk OK. This is a brownout protection feature. The pin monitors the bulk voltage through a resistor divider. When BOK exceeds 2.5 V a 50 A current is sourced from the pin for hysteresis. 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.
2
VCC
3 4
REG SNSB
5
CMPB
6
SS
7
RAMP
8
OSC
9
WBL
10 11
ON BOK
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AS2916
Pin Function Description
Pin Number 12 Function CMPA Description
PWM Controller
This is the Auxiliary convertor error amplifier compensation pin or if secondary controller is desired, the Auxiliary control input pin. A simple capacitor to ground is the only circuitry expected. Note: There is no external connection for voltage feedback. Voltage sensing is provided internally in such a way that VCC not loaded until it reaches predefined threshold. If secondary control is required, it can be forced into the CMPA pin.
is 13 SNSA
This is the Auxiliary convertor current sense pin. An external RC filter from the Auxiliary power FET and slope compensation resistor from the RAMP pin is all the expected external circuitry. This is the gate drive output for the Auxiliary FET. The totem pole output has equivalent of an extra 33 resistor to limit the FET turn on speed and a pull down resistor to ensure the FET gate is never open. No external circuitry except for the FET is expected on this pin. The largest FET expected to be driven is IRF820. If a larger power FET is used, a buffer might be required. Signal ground. Power ground.
14
OUTA
15 16
GND PGND
Absolute Maximum Ratings
Parameter Reference Current Output Current Supply Voltage Output Voltage Continuous Power Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 seconds) Symbol IREF IOUT VCC VOUT PD TJ TSTG TL Rating 200 1 20 20 500 150 -60 to +150 300 Unit mA A V V mW C C C
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PWM Controller
Electrical Characteristics
AS2916
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: VCC = 15 V, BOK = 3 V, ON = 3 V, RT = 680 , CT = 10 nF, and CWBL = 2.2 nF, unless otherwise specified. To override UVLO, VCC should be raised above UVLOHIGH prior to test. Parameter 5 V Regulator Output Voltage Line Regulation Load Regulation Temperature Stability Total Output Variation Long-Term Stability Output Noise Voltage Maximum Source Current Oscillator Initial Frequency Voltage Stability Temperature Stability Amplitude Upper Trip Point Lower Trip Point Discharge Current Duty Cycle Limit Over-Temperature Shutdown Wobble Oscillator Wobble Rate OSC Frequency Deviation Amplitude Upper Trip Point Lower Trip Point Charge Current Discharge Current FWBL DEV VWBL VH VL ICHRG IDSC 2.2 nF WBL to GND Change in main oscillator freq. VWBL peak-to-peak 3.4 +30 4.5 +40 1.8 2.7 0.9 VWBL = 0.7 V VWBL = 4.8 V -25 25 -36 36 -50 50 6.0 +50 kHz kHz V V V A A TOT TCF VOSC VH VL IDSC fOSC TA = 25C, VWBL = 0 V 8.5 V VCC 18V TMIN TJ TMAX VOSC peak-to-peak VWBL = 0 V VWBL = 0 V VOSC = 3 V RT = 680 , CT = 10 nF, TJ = 25C 7.5 46 117 132 0.2 5 1.55 2.8 1.25 8.7 50 140 9.5 54 143 1.0 kHz % % V V V mA % C VNOISE IMAX TCREG Line, Load, Temperature Over 1,000 hrs at 25C 10 f 100 kHz, TJ = 25C VREG = 4.8 V 4.85 5.0 50 30 120 180 VREG PSRR TJ = 25C, IREG = 1 mA 12 VCC 18 V 1.0 IREG 20 mA 4.90 5.00 5 5 0.2 5.10 15 15 0.4 5.15 25 V mV mV mV/C V mV V mA Symbol Test Condition Min. Typ. Max. Unit
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AS2916
Electrical Characteristics
PWM Controller
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: VCC = 15 V, BOK = 3 V, ON = 3 V, RT = 680 , CT = 10 nF, and CWBL = 2.2 nF, unless otherwise specified. To override UVLO, VCC should be raised above UVLOHIGH prior to test. Parameter Symbol Test Condition Min. Typ. Max. Unit
Auxiliary PWM Comparator Input (CMPA) Regulation Voltage Transconductance Output Sink Current Output Source Current Output Swing High Output Swing Low VCCREG Gm ICMPALow VCC = 16 V, VCMPA = 1.1 V ICMPAHigh VCC = 12 V, VCMPA = 5 V VCMPAHigh VCC = 12 V, ICMPA = 0.5 mA VCMPALow VCC = 16 V, ICMPA = 2 mA AVSNSA VLS VSNSA IBIAS -0.2 VSNSA 0.8 V VSNSA = 0 V VCMPA = 5 V 0.95 13.4 14.5 1.0 2.0 -0.5 5.4 6.0 -1.1 5.7 0.2 1.1 15.7 V mS mA mA V V
Auxiliary Current Sense Comparator (SNSA) Transfer Gain CMPA Level Shift Current Sense Threshold Input Bias Current 3.0 1.5 1.05 -1.0 80 1.15 -10 150 V/V V V A ns
Propagation Delay to Output tPD Main PWM Comparator Input (CMPB) Comp Source Current Comp Source Impedance Comp Source High ICMPB VCMPB = 2.5 V ZCMPB VCMPBHigh AVSNSB VLS -0.2 VSNSB 0.8 V VSNSB = 0 V VCMPB = 5 V 0.95 -1.0 10 5.4
-1.4 15 5.6 20
mA k V
Main Current Sense Comparator (SNSB) Transfer Gain CMPB Level Shift Current Sense Threshold Input Bias Current 3.0 1.5 1.05 -1.0 80 1.15 -10 150 V/V V V A ns
VSNSB IBIAS Propagation Delay to Output tPD Soft Start Comparator SS Charge Current SS Discharge Current SS Lower Clamp
ICharge SS VSS VRAMP IDsc SS VSS = 1 V, VON <1.5 V VSS low TJ = 25C TJ = 25C Note: RAMP waveform is same as OSC waveform, but level shifted down one diode drop. IRAMPL IRAMPH TJ = 25C TJ = 25C
-4.0 2.0
-6.0 10 0.05 50
-10
A mA
0.2 100 2.3 0.75
V ns V V mV/C
Propagation Delay to Output tPB RAMP High Level VRAMPH RAMP Low Level RAMP Levels TC VRAMPL
2.0 0.45
2.15 0.6 -2.0
RAMP Sink Current RAMP Source Current
0.1 -2.0
0.2 -10
mA mA
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PWM Comtroller
Electrical Characteristics
AS2916
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: VCC = 15 V, BOK = 3 V, ON = 3 V, RT = 680 , CT = 10 nF, and CWBL = 2.2 nF ,unless otherwise specified. To override UVLO, VCC should be raised above UVLOHIGH prior to test. Parameter Main Output Output Low Level Output Low Level Output High Level Output High Level On Resistance High Rise Time Fall Time Output Impedance to GND in UVLO State Auxiliary Output Output Low Level Output Low Level Output High Level Output High Level VOUTBL VOUTBL VOUTBH VOUTBH ISINK = 10 mA ISINK = 150 mA ISOURCE = 10 mA, VCC = 15V, VCMPA = 5 V ISOURCE = 110 mA, VCC = 15V, VCMPA = 5 V CL =350 pF, 10% to 90% CL = 350 pF, 90% to 10% VCC = 6 V 12 7 0.1 1.5 13 8 0.4 2.2 V V V V 150 150 ns ns k tR tF ZOUT CL = 1.3 nF, 10% to 90% CL = 1.3 nF, 90% to 10% VCC = 6 V VOUTBL VOUTBL VOUTBH VOUTBH ISINK = 10 mA ISINK = 150 mA ISOURCE = 10 mA, VCC = 15 V ISOURCE = 150 mA, VCC = 15V 12 10 0.1 1.5 13 10.7 10 50 50 20 150 150 0.4 2.2 V V V V ns ns k Symbol Test Condition Min. Typ. Max. Unit
On Resistance High Rise Time Fall Time Output Impedance to GND in UVLO State Under-Voltage Lockout Start-Up Threshold Stop Threshold Start-Up Current Operating Supply Current Housekeeping BOK UV Threshold BOK UV Hysteresis Current BOK Input Bias Current ON Threshold ON Hysteresis ON Bias Current VBOK UV TJ = 25C IHYST BOK VBOK = 2.6 V IBOK VBOK = 2.4 V VON VON IBIAS ON VON = 2.3 V 2.50 42 VCC(ON) VCC(OFF) ICC ICC VCC = 15 V 12.4 7 tR tF ZOUT
33 70 50 20
13.5 7.5 0.1 18
14.7 8 25 25
V V A mA
2.537 50 -0.1
2.575 58 -1.0 2.65 -1.1 -10
V A A V V A
2.35 -0.7
2.5 -0.9 -0.5
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