lm5035mhx National Semiconductor Corporation, lm5035mhx Datasheet - Page 4

• Manufacturer Part Number: lm5035mhx
• Description: Pwm Controller With Integrated Half-bridge And Syncfet Drivers
• Manufacturer: National Semiconductor Corporation

www.national.com
TSSOP
Pin Descriptions
PIN
EP
10
11
12
13
14
15
16
17
18
19
20
LLP
PIN
EP
11
12
13
14
15
16
17
18
19
21
10
20
22
9
1
PGND
Name
RES
VCC
REF
SR2
SR1
VIN
HO
NC
NC
NC
NC
HB
HS
LO
EP
(Continued)
Restart Timer
Boost voltage for the HO driver
Switch node
High side gate drive output.
Low side gate drive output.
Power Ground
Output of the high voltage
start-up regulator. The VCC
voltage is regulated to 7.6V.
Synchronous rectifier driver
output.
Synchronous rectifier driver
output.
Output of 5V Reference
Input voltage source
Exposed Pad, underside of
package
No connection
No connection
No connection
No connection
Description
4
If cycle-by-cycle current limit is exceeded during any cycle, a
22µA current is sourced to the RES pin capacitor. If the RES
capacitor voltage reaches 2.5V, the soft-start capacitor will be
fully discharged and then released with a pull-up current of
1.2µA. After the first output pulse at LO (when SS
offset, typically 1V), the SS pin charging current will revert to
55µA.
An external diode is required from VCC to HB and an external
capacitor is required from HS to HB to power the HO gate
driver.
Connection common to the transformer and both power
switches. Provides a return path for the HO gate driver.
Output of the high side PWM gate driver. Capable of sinking
2A peak current.
Output of the low side PWM gate driver. Capable of sinking 2A
peak current.
Connect directly to Analog Ground.
If an auxiliary winding raises the voltage on this pin above the
regulation setpoint, the Start-up Regulator will shutdown, thus
reducing the internal power dissipation.
Control output of the synchronous FET gate. Capable of 0.5A
peak current.
Control output of the synchronous FET gate. Capable of 0.5A
peak current.
Maximum output current is 20mA. Locally decoupled with a
0.1µF capacitor.
Input to the Start-up Regulator. Operating input range is 13V to
100V with transient capability to 105V. For power sources
outside of this range, the LM5035 can be biased directly at
VCC by an external regulator.
No electrical contact. Connect to system ground plane for
reduced thermal resistance.
No electrical contact.
No electrical contact.
No electrical contact.
No electrical contact.
Application Information
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