Rainbow-electronics MAX5953D Manual do Utilizador Página 3
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MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= (V+ - V
EE
) = 48V, GATE = PGOOD = PGOOD = unconnected, GND = OUT, HVIN = V+, UVLO = V
EE
, T
J
= 0°C to +125°C, unless
otherwise noted. Typical values are at T
J
= +25°C. All voltages are referenced to V
EE
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5953A/MAX5953C 7.1
Default Power Turn-On/Off
Hysteresis Voltage
V
HYST
,
UVLO
MAX5953B/MAX5953D 4
V
External UVLO Programming
Range
V
IN,EX
MAX5953A/MAX5953C only (Note 7) 12 67 V
UVLO External Reference
Voltage
V
REF
,
UVLO
V
UVLO
increasing
2.400 2.460 2.522
V
UVLO External Reference
Voltage Hysteresis
V
HYST
,
UVLO
Ratio to V
REF, UVLO
19.2
20
20.9
%
UVLO Bias Current I
IN,UVLO
V
UVLO
= 2.460V
-1.5 +1.5
µA
UVLO Input Ground-Sense
Threshold
V
TH
,
G
,
UVLO
(Note 8) 50 440 mV
UVLO Input Ground-Sense Glitch
Rejection
7µs
Power Turn-Off Voltage,
Undervoltage Lockout Deglitch
Time
t
OFF_DLY
V
IN
, V
UVLO
falling (Note 9)
0.32
ms
Isolation Switch n-Channel
MOSFET On-Resistance
R
ON,ISO
Output current = 300mA, V
GATE
= 5.6V,
measured between OUT and V
EE
0.6 1.5 Ω
Isolation Switch n-Channel
MOSFET Off-Threshold Voltage
V
GSTH
V
GATE
- V
EE
, OUT = V+,
output current < 1µA
0.5 V
GATE Pulldown Switch
Resistance
R
G
Power-off mode, V
IN
= +12V 38 80 Ω
GATE Charging Current I
GATE
V
GATE
= 2V 4.5 10
16.5
µA
GATE High Voltage V
GATE
I
GATE
= 1µA
5.59 5.76 5.93
V
V
OUT
- V
EE
decreasing, V
GATE
= 5.75V
1.16 1.23 1.31
V
PGOOD Assertion V
OUT
Threshold (Note 10)
V
OUTEN
Hysteresis 70 mV
V
GATE
- V
EE
increasing
4.62 4.76 4.91
V
PGOOD, PGOOD Assertion
V
GATE
Threshold
V
GSEN
Hysteresis 80 mV
PGOOD, PGOOD Output Low
Voltage
V
OL
,
PGOOD
I
SINK
= 2mA, V
OUT
≤ (V+ - 5V) (Note 11) 0.2 V
PGOOD Leakage Current
GATE = high, V+ - V
OUT
= 67V (Note 11)
1µA
PGOOD Leakage Current
GATE = V
EE
, PGOOD - V
EE
= 67V
(Note 11)
1µA
- General Description 1
- Features 1
- Ordering Information 1
- Applications 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- Pin Description 10
- Pin Description (continued) 11
- Typical Application Circuit 12
- MAX5953A 13
- Detailed Description 15
- Optocoupled Feedback 17
- Internal Regulators 17
- Applications Information 18
- Table 3. Component Suppliers 21
- Block Diagrams 22
- Block Diagrams (continued) 23
- Typical Operating Circuit 24
- Chip Information 25
- Selector Guide 25
- Pin Configuration 25
- Package Information 26
- M. Quijano 27
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