mic9130 Micrel Semiconductor, mic9130 Datasheet - Page 8

• Manufacturer Part Number: mic9130
• Description: High-voltage, High-speed Telecom Dc-to-dc Controller
• Manufacturer: Micrel Semiconductor

MIC9130
Functional Block Diagram
M9999-040805
VBIAS
RBIAS
CPWR
ISNS
LINE
VCC
EN
SS
14
9
10
3
12
8
2
1
5V
5V
FB
7
4µA
BIAS
REG
1.21V
Amplifier
40µA
COMP
Error
0.82V
Shutdown
Thermal
6
OSC
1.2V
Q
Oscillator
PWM
Current Limit
Duty Cycle
4
Max.
1000000
5
Peak
SYNC
R1
R2
100000
S
10000
1000
10000
13
UVLO
220 p F
470 p F
680 p F
1000 p F
2200 p F
100 p F
47pF
Oscillator Frequency vs.
2
100000
FREQUENCY (Hz)
VCC
UVLO
LINE
UVLO
Figure 1
5V
RC Values
Current
Limit
Selection
8
MAXIMUM DUT Y CYCLE
1000000 10000000
1-Shot
UNDERVOLTAGE LOCKOU T
R
S1
S2
SR Latch
Q
*See applications section for higher
switching frequencies
VCC
16
15
11
OUT
PGND
AGND
Micrel, Inc.
April 2005