ST VIPER17 User Manual

现货库存、技术资料、百科信息、热点资讯，精彩尽在鼎好!

Features

VIPER17

Off-line high voltage converters

■ 800 V avalanche rugged power section

■ PWM operation with frequency jittering for low

EMI

■ Operating frequency:

– 60 kHz for L type
– 115 kHz for H type

■ Standby power < 50 mW at 265 Vac

■ Limiting current with adjustable set point

■ Adjustable and accurate over voltage

protection

■ On-board soft-start

■ Safe auto-restart after a fault condition

■ Hysteretic thermal shutdown

Application

■ Adapters for PDA, camcorders, shavers,

cellular phones, videogames

■ Auxiliary power supply for LCD/PDP TV,

monitors, Audio systems, computer, industrial

■ SMPS for set-top boxes, DVD players and

recorders, white goods.

DIP-7DIP-7

Description

The device is an off-line converter with an 800 V
rugged power section, a PWM control, two levels
of over current protection, over voltage and
overload protections, hysteretic thermal
protection, soft-start and safe auto-restart after
any fault condition removal. Burst mode operation
and device very low consumption helps to meet
the standby energy saving regulations.

Advance frequency jittering reduces EMI filter
cost. Brown-out function is embedded into the
high voltage start-up.

Figure 1. Typical topology

Table 1. Device summary

Order codes Package Packaging

VIPER17LN

VIPER17HN

February 2008 Rev 2 1/31

DIP-7 Tube

www.st.com

31

Contents VIPER17

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Typical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6 Typical circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Operation descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.1 Power section and gate driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.2 High voltage startup generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.3 Power-up and soft-start up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.4 Power down operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.5 Auto restart operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.6 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.7 Current mode conversion with adjustable current limit set point . . . . . . . 19

7.8 Over Voltage Protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.9 About CONT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.10 Feed-back and Over Load Protection (OLP) . . . . . . . . . . . . . . . . . . . . . . 21

7.11 Burst-mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 24

7.12 Brown-out protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.13 2nd level over current protection and hiccup mode . . . . . . . . . . . . . . . . . 27

2/31

VIPER17 Contents

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3/31

Block diagram VIPER17

1 Block diagram

Figure 2. Block diagram

BR

VDD

Vcc

DRAIN

CONT

15uA

OVP

LOGIC

OVP

0.45V

SOFT

START

.

-

+

6uA

OCP

BLOCK

Vin_OK

FB

2 Typical power

Table 2. Typical power

Inte rnal Supply bus

&

Ref erence Voltages

-

OCP

+

PWM

+

-

+

-

Ref

BURST-MODE

LOGIC

2nd OCP

LOGIC

BURST

SUPPLY

& UVLO

UVLO

LEB

BURST

OSCILLATOR

TUR N -ON

LOGIC

OVP

OTPOLP

HV_ON

S

R1

Istart-up

THE RMA L

SHUTDOWN

OTP

Q

R2

Rsense

GND

230 V

Part number

Adapter

(1)

AC

Open frame

(2)

Adapter

VIPER17 9 W 12 W 5 W 7 W

1. Typical continuous power in non ventilated enclosed adapter measured at 50 °C ambient.

2. Maximum practical continuous power in an open frame design at 50

°C ambient, with adequate heat sinking.

4/31

85-265 V

(1)

AC

Open frame

(2)

VIPER17 Pin settings

3 Pin settings

3.1 Connection diagram

Figure 3. Connection diagram (top view)

3.2 Pin description

Table 3. Pin description

N. Name Function

1 GND This pin represents the device ground and the source of the power section.

2VDD

3CONT

4FB

Supply voltage of the control section. This pin also provides the charging
current of the external capacitor during start-up time.

Control pin. The following functions can be selected:

1. current limit set point adjustment. The internal set default value of the cycle­by-cycle current limit can be reduced by connecting to ground an external
resistor.

2. output voltage monitoring. A voltage exceeding 3V shuts the IC down
reducing the device consumption. This function is strobed and digitally filtered
for high noise immunity.

Control input for duty cycle control. Internal current generator provides bias
current for loop regulation. A voltage below 0.5 V activates the burst-mode
operation. A level close to 3.3 V means that we are approaching the cycle-by­cycle over-current set point.

GND

VDD

CONT

FB

DRAIN

DRAIN

BR

5BR

7,8 DRAIN

Brownout protection input with hysteresis. A voltage below 0.45 V shuts down
(not latch) the device and lowers the power consumption. Device operation
restarts as the voltage exceeds 0.45 V plus hysteresis voltage. It can be
connected to ground when not used.

High voltage drain pin. The built-in high voltage switched start-up bias current is
drawn from this pin too.

5/31

Electrical data VIPER17

4 Electrical data

4.1 Maximum ratings

Table 4. Absolute maximum ratings

Symbol Pin Parameter Value Unit

V

DRAIN

E

I

AR

I

DRAIN

V

CONT

V

V

V

P

TOT

T

T

STG

AV

FB

BR

DD

J

7, 8 Drain-to-source (ground) voltage 800 V

7, 8 Repetitive avalanche energy (limited by TJ = 150 °C) 2 mJ

7, 8 Repetitive avalanche current (limited by TJ = 150 °C ) 0.6 A

7, 8 Pulse drain current 0.7 A

3 Control input pin voltage (with I

4 Feedback voltage -0.3 to 5.5 V

5 Brown-out input pin voltage 2 V

2 Supply voltage (IDD = 25 mA) Self limited V

4.2 Thermal data

Table 5. Thermal data

Symbol Parameter Max value Unit

R

R

Thermal resistance junction pin 40 °C/W

thJP

Thermal resistance junction ambient

thJA

= 1 mA) Self limited V

CONT

Power dissipation at TA < 50 °C 1 W

Operating junction temperature range -40 to 150 °C

Storage temperature -55 to 150 °C

90 °C/W

(1)

80

°C/W

1. When mounted on a standard single side FR4 board whit 200 mm2 (0.31 sq in) Of Cu (35 m thick)

6/31

VIPER17 Electrical data

4.3 Electrical characteristics

(TJ = -25 to 125 °C, VDD = 14 V; unless otherwise specified)

Table 6. Power section

Symbol Parameter Test condition Min Typ Max Unit

I

= 1 mA, VFB = GND

V

BVDSS

I

OFF

R

DS(on)

C

OSS

Table 7. Supply section

Break-down voltage

OFF state drain current

Drain-source on state
resistance

Effective (energy related)
output capacitance

Symbol Parameter Test condition Min Typ Max Unit

DRAIN

TJ = 25 °C

V

V

I

= max rating,

DRAIN

= GND

FB

= 0.2 A, VFB = 3 V,

DRAIN

VBR = GND, TJ = 25 °C

I

= 0.2 A, VFB = 3 V ,

DRAIN

VBR = GND, TJ = 125 °C

V

= 0 to 640 V 10 pF

DRAIN

800 V

60 µA

20 24 Ω

40 48 Ω

Volt ag e

V

DRAIN

I

DD_CH

V

DD

V

DDclamp

V

DDon

V

DDoff

V

DD(RESTART)

Current

I

DD0

I

DD1

I

DD_FAULT

I

DD_OFF

_START

Drain-source start voltage 60 80 100 V

Start up charging current

V

VBR = GND, VFB = GND,
V

V

V

= 120 V,

DRAIN

= 4 V

DD

= 120 V ,

DRAIN

= GND, VFB = GND,

BR

-2 -3 -4 mA

-0.4 -0.6 -0.8 mA

VDD = 4 V after fault.

Operating voltage range After turn-on 8.5 23.5 V

VDD clamp voltage IDD = 20 mA 23.5 V

VDD start up threshold

VDD under voltage
shutdown threshold

VDD restart voltage
threshold

Operating supply current,
not switching

Operating supply current,
switching

Operating supply current,
with protection tripping

Operating supply current
with VDD < V

DD_OFF

V

V

V

= 120 V,

DRAIN

= GND, VFB = GND

BR

= 120 V,

DRAIN

VBR = GND, VFB = GND

VFB = GND, FSW = 0 k H z ,
VBR = GND, VDD = 10 V

V

DRAIN

= 120 V,

FSW = 60 kHz

V

DRAIN

= 120 V,

FSW = 115 kHz

VDD = 7 V 270 uA

13 14 15 V

7.588.5V

44.55 V

0.9 mA

1.8 mA

2mA

400 uA

7/31

Electrical data VIPER17

Table 8. Controller section

(T

= -25 to 125 °C, V

J

Symbol Parameter Test condition Min Typ Max Unit

Feedback pin

= 14 V; unless otherwise specified)

DD

V

FB_olp

V

FB_lin

V

FB_bm

V

FB_bm_hys

Over load shut down
threshold

Linear dynamics upper limit 3.2 3.3 3.4 V

Burst mode threshold Voltage falling 0.5 V

Burst mode hysteresis Voltage rising 50 mV

4.7 4.8 5.2 V

VFB = 0.3 V -150 -200 -280 uA

I

R

FB(DYN)

H

FB

FB

Feedback sourced current

Dynamic resistance V

∆VFB / ∆I

D

3.3 V < V

FB

< 4.8 V -3 uA

FB

< 3.3 V 14 19 kΩ

49V/A

CONT pin

VCONT_l Low level clamp voltage I

= -100 uA 0.5 V

CONT

Current limitation

VFB = 4 V,

I

Dlim

Max drain current limitation

I

CONT

= -10 µA

0.38 0.4 0.42 A

TJ = 25 °C

t

SS

T

ON_MIN

Soft-start time 8.5 ms

Minimum turn ON time 400 ns

td Propagation delay 150 ns

t

LEB

I

D_BM

Leading edge blanking 300 ns

Peak drain current during
burst mode

Oscillator section

VIPER17L VDD = operating

F

OSC

VIPER17H 103 115 127 kHz

FD Modulation depth

FM Modulation frequency 250 Hz

D

MAX

Maximum duty cycle 70 80 %

8/31

V

= 0.6 V 90 mA

FB

54 60 66 kHz
voltage range,
VFB = 1 V

VIPER17L ±4 kHz

VIPER17H ±8 kHz

VIPER17 Electrical data

Table 8. Controller section (continued)

(T

= -25 to 125 °C, V

J

Symbol Parameter Test condition Min Typ Max Unit

= 14 V; unless otherwise specified)

DD

Over current protection ( 2

I

DMAX

Second over current
threshold

Over voltage protection

V

OVP

T

STROBE

Over voltage protection
threshold

Over voltage protection
strobe time

Brown out protection

V

BRth

V

BR Hyst

I

BR Hyst

V

V

BR

DIS

Brown out threshold

Voltage hysteresis above
V

BRth

Current hysteresis 7 10 uA

Operating range 0.15 2 V

Brown out disable voltage 50 150 mV

Thermal shutdown

T

T

SD

HYST

Thermal shutdown
temperature

Thermal shutdown
hysteresis

nd

OCP )

0.6 A

2.7 3 3.3 V

2.2 us

0.41 0.45 0.49 V

50 mV

Voltage falling

150 170 °C

30 °C

9/31

Electrical data VIPER17

Figure 4. Minimum turn-on time test circuit

Figure 5. Brown out threshold test circuits

Figure 6. OVP threshold test circuits

10/31

(The OVP protection is triggered
after four consecutive oscillator cycles)