MIC2595-2BM TR Micrel Inc, MIC2595-2BM TR Datasheet - Page 27

• Manufacturer Part Number: MIC2595-2BM TR
• Description: IC CTRLR HOT SWAP NEG HV 14-SOIC
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2595-2BM TR

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: -19 V ~ -80 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: MIC2595-2BMTR; MIC2595-2BMTR

December 2005
Power-Good Signals Driving Optoisolators
The PWRGDx signals can be used to drive
optoisolators or LEDs. The use of an optoisolator is
sometimes needed to protect I/O signals (e.g.,
/PWRGD, RESET, ENABLE) of both the controller
and downstream DC-DC converter(s) from damage
(Short Pin)
(Long Pin)
(Long Pin)
-48V RTN
-48V RTN
-48V RTN
SMAT70A
*D1
Nominal Undervoltage and Overvoltage Thresholds:
*Optional components (See Funtional Description and Applications Information for more details)
#An external pull-up resistor for the power-good signal is necessary for DC-DC convertors (and all other load modules) not equipped with an
internal pull-up impedance
V
V
0.47µF
UV
OV
= 36.5V
= 71.2V
C1
689k
R1
1%
12.4k
1%
R3
11.8k
1%
R2
43k
R5
Figure 11. Optoisolators Driven by /PWRGD Signals
0.068µF
0.068µF
C
C
2.2µF
FILTER
TIMER
C
NLD
43k
R6
2
1
MOC207-M
OPTO#1
1
2
3
4
5
6
7
/PWRGD1
PGTIMER
UV
OV
CFILTER
CNLD
VEE
MIC2589-2BM
43k
R7
R
6
5
0.01
SENSE
5%
/PWRGD3
/PWRGD2
SENSE
DRAIN
GATE
VDD
N/C
2
1
14
13
12
11
10
9
8
MOC207-M
OPTO#2
0.1µF
27
*C2
caused by common mode transients.
case when an EMI filter is utilized to prevent DC-DC
converter switching noise from being injected back
onto the power supply. The circuit of Figure 11 shows
how to configure an optoisolator driven by the
/PWRGD
SUM110N10-09
6
5
100µF
M1
R4
10
C4
100µF
100µF
2
1
MOC207-M
signal
C6
C8
OPTO#3
0.1µF
0.1µF
6
5
0.1µF
C5
C3
C7
of
the
IN+
ON/OFF*
IN–
IN+
ON/OFF*
IN–
IN+
ON/OFF*
IN–
MIC2589
OUT+
OUT–
OUT+
OUT–
OUT+
OUT–
[phone]
M9999-120505
Such is the
-48V RTN
+5V
+5V RTN
+2.5V
+2.5V RTN
+1.8V
+1.8V RTN
controller.
OUT
OUT
OUT