LT1738EG#PBF Linear Technology, LT1738EG#PBF Datasheet - Page 8

• Manufacturer Part Number: LT1738EG#PBF
• Description: IC DC/DC CONTRLR LOW NOIS 20SSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost), Cuk, Flybackr

Specifications of LT1738EG#PBF

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5 ~ 100 V
• Frequency - Switching: 20kHz ~ 250kHz
• Voltage - Input: 2.55 ~ 20 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

PI FU CTIO S
LT1738
V
compensation and current limiting. It is the output of the
error amplifier and the input of the current comparator.
Loop frequency compensation can be performed with an
RC network connected from the V
voltage on V
The normal range of voltage on this pin is 0.25V to 1.27V.
However, during slope compensation the upper clamp
voltage is allowed to increase with the compensation.
During a short-circuit fault the V
ground.
BLOCK DIAGRA
8
C
U
(Pin 12): The compensation pin is used for frequency
U
NFB
C
SS
FB
V
R
C
C
T
T
is proportional to the switch peak current.
10
12
13
9
8
7
100k
U
OSCILLATOR
W
SYNC
–
+
NEGATIVE
FEEDBACK
6
AMP
50k
C
pin will be discharged to
1.25V
C
pin to ground. The
+
+
–
S
R
ERROR
SHDN
AMP
FF
REGULATOR
14
COMP
Q
V
–
+
17
IN
V
REG
Figure 1a. Typical Test Circuitry
TEST CIRCUITS
V5
GATE
5
CAP
TO
DRIVERS
5pF
2
R
20mA
15
ZVN3306A
CSL
CONTROL
IN5819
SLEW
GND
11
10
R
16
1738 F01a
VSL
SUB
+
–
SENSE
AMP
+
–
Figure 1b. Test Circuit for Slew
GATE
CAP
CS
1738 BD
5pF
20
3
2
1
4
0.1
GCL
CAP
GATE
PGND
CS
0.9A
Si4450DY
IN5819
10
1738 F01b
+
–
1738fa