254
www.ptcc.com.tw
AS2916
PWM Controller
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: 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, VCCshould be raised above UVLOHIGH
prior to test.
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Auxiliary PWM Comparator Input (CMPA)
Regulation Voltage
VCCREG
Gm
ICMPALow
ICMPAHighVCC= 12 V, VCMPA= 5 V
VCMPAHighVCC= 12 V, ICMPA= 0.5 mA
VCMPALowVCC= 16 V, ICMPA= 2 mA
13.4
14.5
15.7
V
Transconductance
1.0
mS
Output Sink Current
VCC= 16 V, VCMPA= 1.1 V
2.0
6.0
mA
Output Source Current
–0.5
-1.1
mA
Output Swing High
5.4
5.7
V
Output Swing Low
0.2
1.1
V
Auxiliary Current Sense Comparator (SNSA)
Transfer Gain
AVSNSA
VLS
VSNSA
IBIAS
–0.2
≤
VSNSA
≤
0.8 V
VSNSA= 0 V
VCMPA= 5 V
3.0
V/V
CMPA Level Shift
1.5
V
Current Sense Threshold
0.95
1.05
1.15
V
Input Bias Current
–1.0
–10
μA
Propagation Delay to Output tPD
Main PWM Comparator Input (CMPB)
80
150
ns
Comp Source Current
ICMPB
ZCMPB
VCMPBHigh
VCMPB= 2.5 V
–1.0
–1.4
mA
k
V
Comp Source Impedance
10
15
20
Comp Source High
5.4
5.6
Main Current Sense Comparator (SNSB)
Transfer Gain
AVSNSB
VLS
VSNSB
IBIAS
–0.2
≤
VSNSB
≤
0.8 V
VSNSB= 0 V
VCMPB= 5 V
3.0
V/V
CMPB Level Shift
1.5
V
Current Sense Threshold
0.95
1.05
1.15
V
Input Bias Current
–1.0
–10
μA
Propagation Delay to Output tPD
Soft Start Comparator
80
150
ns
SS Charge Current
ICharge SSVSS
≤
VRAMP
IDsc SS
VSS low
–4.0
–6.0
–10
μA
SS Discharge Current
VSS= 1 V, VON<1.5 V
2.0
10
mA
SS Lower Clamp
0.05
0.2
V
Propagation Delay to Output tPB
RAMP High Level
50
100
ns
VRAMPH
VRAMPL
TJ= 25°C
TJ= 25°C
Note: RAMP waveform is same
as OSC waveform, but level
shifted down one diode drop.
2.0
2.15
2.3
V
RAMP Low Level
0.45
0.6
0.75
V
RAMP Levels TC
–2.0
mV/°C
RAMP Sink Current
IRAMPL
IRAMPH
TJ= 25°C
TJ= 25°C
0.1
0.2
mA
RAMP Source Current
–2.0
–10
mA