MIC9130 Datasheet, PDF (8/19 Pages) Micrel Semiconductor – High-Voltage, High-Speed Telecom DC-to-DC Controller

MIC9130
Oscillator Frequency vs.
RC Values
1000000
47pF
100pF
100000 ^220pF
470pF
680pF
1000pF
10000 _2200pF
Micrel, Inc.
101000000
100000 1000000 10000000
FREQUENCY (Hz)
*See applications section for higher
switching frequencies
Functional Block Diagram
FB
COMP OSC
SYNC
7
6
4
5
Oscillator
Error 1.2V
Amplifier
ISNS ₁₄
40µA
VBIAS 9 _5V
EN 10
RBIAS 3
BIAS
REG
0.82V
1.21V
5V
PWM
Peak
Current Limit
4µA
SS 12
CPWR 8
Max.
Duty Cycle
VCC 2
Q
R1
R2
S
LINE 1
2
5V
SR Latch
R
Q
S1
S2
MAXIMUM DUTY CYCLE
Current
Limit
Selection
VCC
UVLO
1-Shot
UNDERVOLTAGE LOCKOUT
M9999-040805
Thermal
Shutdown
13
UVLO
LINE
UVLO
Figure 1
8
VCC
16 OUT
15 PGND
11 ^AGND
April 2005