Datasheet

RT
RES
AGND
REF
DISABLE
VCC
HO Driver
LO Driver
LEVEL SHIFT/
ADAPTIVE
TIMER
+
-
S R Q
Q
CLK
+
-
+
-
-+
+ +
-
1.2V
DEMB
SS Current
VIN
VCC
UVLO
VCC OFF
FB
SS
HB
HO
SW
LO
CS
PGND
COMP
CSG
CM
VCC Regulator
THERMAL
SHUTDOWN
UVLO
Shutdown Threshold
STANDBY
STANDBY
VCC OFF
RES RESET
UVLO
Threshold
UVLO Hysteresis
Current
RESTART
TIMER
HICCUP MODE
FAULT TIMER
256 CYCLES
RES
Current
UVLO
VCC
STANDBY
DE_ENABLE
+
-
STANDBY
RES RESET
HICCUP
10uV
CS(TH)
PWM
Comparator
C/L
Comparator
50 k:
+
-
+
-
DE_ENABLE
2.0/2.5V
OSCILLATOR/
SYNC DETECTOR
CLK
A=2
40 k:
CONDITIONER
Current Sense
Amplifier
RAMP
HO_ENABLE
+
-
+
-
ZCD
Comparator
-5 mV
DIODE
EMULATION
CONTROL
LO_ENABLE
ERR
AMP
VCCDIS
500 k:
VCCDIS
Threshold
VCC OFF
+
-
DE_ENABLE
LM25117
REF
V
OUT
V
IN
C
IN
C
OUT1
C
OUT2
L
O
Q
H
Q
L
R
SNB
C
SNB
R
S
R
GH
R
GL
D
HB
C
VCC
C
CS
R
CS2
R
CS1
C
HB
R
VIN
C
VIN
SYNC
C
FT
C
RAMP
R
RAMP
R
FB2
R
FB1
R
COMP
C
COMP
C
HF
C
SYNC
R
T
C
RES
C
SS
R
UV2
R
UV1
R
CM
C
CM
STANDBY
STANDBY
VCC OFF
HO_ENABLE
HB
UVLO
Current Monitor
Amplifier
A=10
LM25117
LM25117-Q1
SNVS714E –APRIL 2011–REVISED MARCH 2013 www.ti.com
BLOCK DIAGRAM AND TYPICAL APPLICATION CIRCUIT
Figure 17. Block Diagram and Typical Application Circuit
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