ISL6401 Datasheet, PDF (2/11 Pages) Intersil Corporation – Synchronizing Current Mode PWM for Subscriber Line Interface Circuits (SLICs)

ISL6401
Functional Block Diagram
4
5
FB
9 CS
10
14
1
GND VCC
SD
VREF
VOLTAGE
COMP
REFERENCE
ERROR
IBIAS
AMP
+
-
ICSCOMP
-
+
200K
ILIM
3
2
CT
SYNC
OSC
S
RQ
PVCC ¹³
GATE ₁₂
VREF
CS
SOFT-START
POR SOFT-
UVLO
START
CLK
ENPWM
TFF
CLK Q
R
-
LVC
+
ICLCOMP
LEADING
EDGE
BLANKING
NC 8
NFB_IN
7
11
PWRGND
V_CC
-
+
NFB
AMP
NFB-OUT
6
Typical Application Schematic for 4 Line VoIP
VIN
9V TO
20V
VCC
+5V
±10%
GND
C4
560pF
C5
220pF
E
C6
R1
0.027µF 20K
R2
10K
R3
1.24K
C1A-E
2.2µF
35V
1 SD
V_CC 14
2 SYNC PV_CC 13
3 _CT
GATE ¹²
4 COMP GNDP 11
5 _FB
GND ¹⁰
6 NFB
CS 9
7 NFB_IN NC 8
ISL6401
C2
1µF
50V
8
0000
PRI
1
C3
1µF
16V
Q1
IRLR2905
R6
100
T1 2
00
SEC
07
3
+ ^C10A
330µF
D1
35V
MUR5120T3
06
4
D2
0 ^{5 MUR5160T3}
IFLY0012
R7
220
C9
100µF
C8
100V ⁺
330pF
C7
1000pF
R5
0.025
1W
R4B
143K
GND
C11
1µF
VOUT1 _-24V,
120mA
VOUT2
C12
0.1µF
-72V,
120mA
R4A
43.5K
NOTES:
3. C2 fit as close as possible to transformer.
4. T1 = IFLY0012 contacts: Coilcraft: [phone] GCI Technology: [phone] ext. 245
5. For custom specific designs or questions please contact Intersil at 1-888-INTERSIL or 321-724-7143.
2
FN9007.7
April 13, 2005