PM8803 STMicroelectronics, PM8803 Datasheet - Page 15

• Manufacturer Part Number: PM8803
• Description: High efficiency integrated IEEE 802.3at PoE-PD interface and PWM controller type 2 PSE indicator, plus support for forward active clamp topology
• Manufacturer: STMicroelectronics

PM8803
Table 6.
Oscillator
F
Delay time
Soft-start
T
Current limit
PWM comparator
Output driver GAT1
osc
SS
Symbol
Electrical characteristics - SMPS section
Frequency accuracy
Frequency
programmability
Frequency range
FRS voltage
GAT1 to GAT2 delay time
DT voltage
Soft-start time
Delay to output
Cycle-by-cycle current
limit threshold voltage
Leading edge blanking
time
Slope compensation
current
Delay to output
Minimum duty cycle
Maximum duty cycle
CTL to PWM gain
CTL operative range
Output high
Output low
Fall time
Rise time
Parameter
In the range 100 to 500 kHz
Guaranteed by design
Guaranteed by design
CTL = 0, CS = 0
Guaranteed by design
I
R
R
R
R
Over CTL full range (0 to 3 V), at
F
Sourced by CS pin
CTL = 2 V, CS = 0, F
I
C
Guaranteed by design
C
Guaranteed by design
GD
GD
osc
FRS
FRS
DT
DT
LOAD
LOAD
= 100 mA
= -100 mA
= 20 kΩ, GAT1and GAT2 open
= 200 kΩ, GAT1and GAT2 open
= 250 kHz
Doc ID 018559 Rev 1
= 100 kΩ
= 47.5 kΩ
= 3.3 nF, VC = 10 V
= 3.3 nF, VC = 10 V
Test conditions
osc
= 250 kHz
Min.
1.20
1.20
0.44
220
445
100
45
75
1
Electrical specifications
+/-10
Typ.
1.25
1.25
12.3
0.50
1 : 4
0.25
0.25
VC-
245
495
320
32
20
60
45
25
80
40
45
VC-0.5
Max.
1000
1.30
1.30
0.56
270
545
0.5
75
85
0
3
Unit
kHz
kHz
kHz
ms
μA
15/34
ns
ns
ns
ns
ns
ns
ns
%
%
%
V
V
V
V
V
V