Si9118 Vishay Intertechnology, Si9118 Datasheet - Page 5

• Manufacturer Part Number: Si9118
• Manufacturer: Vishay Intertechnology

Document Number: 70815
S-60752—Rev. B, 05 Apr-99
PWM/PSM
Pin Number
COMP
SS/EN
C
V
+V
OSC
REF
FB
10
11
12
13
14
15
16
NI
1
2
3
4
5
6
7
8
9
IN
1
2
3
4
5
6
7
8
Si9118DY
SYNC or V
Top View
PWM/PSM
Symbol
SOIC
COMP
SS/EN
C
R
D
V
I
+V
–V
LIMIT
V
I
FB
D
NI
OSC
OSC
MAX
REF
CS
CC
R
IN
IN
SC
16
15
14
13
12
11
10
9
Input bus voltage ranging from 10 V to 200 V.
Connected to V
4-V reference voltage. Decouple with 0.1- F ceramic capacitor.
Non-inverting input of an error amplifier.
Inverting input of an error amplifier.
Error amplifier output for external compensation network.
Programmable soft-start with external capacitor or externally controlled disable mode.
External capacitor to determine the switching frequency.
External resistor to determine the switching frequency.
Pulse by pulse peak current limiting pin. When the current sense voltage exceeds the current limit threshold, the gate
drive signal is terminated. I
Current sense input to control feedback response.
Si9118: slope compensation pin. Si9119: clock synchronization pin. Logic high to low transition from external signal
synchronizes the internal clock frequency.
Sets the maximum duty cycle. Internally, the maximum duty cycle is clamped to 80%.
Single point ground.
Gate drive for the external MOSFET switch.
Supply voltage for the IC after the startup transition.
Current
Output
V
DR
–V
D
V
I
I
R
Sense
CS
LIMIT
CC
MAX
SC
OSC
IN
REF
V
0.85
CC
forces the converter into PWM mode. Connected to –V
0
New Product
50%
LIMIT
t
r
FIGURE 1.
is also used to sense the current in pulse skipping mode.
COMP
10 ns
PWM/PSM
t
d
SS/EN
C
V
+V
OSC
REF
90%
FB
NI
IN
Description
1
2
3
4
5
6
7
8
0
Si9119DY
Top View
SOIC
IN
forces the converter into PSM mode.
16
15
14
13
12
10
11
9
www.Vishay Siliconix.com FaxBack
V
DR
–V
D
SYNC
I
I
R
Vishay Siliconix
CS
LIMIT
CC
Si9118/Si9119
MAX
OSC
IN
SOIC: Si9118DY
Order Number
408-970-5600
Si9119DY
5