Datasheet

○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays

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TSZ02201-0F1F0C300020-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

2013.07.25 Rev.001

TSZ22111・14・001

www.rohm.com

AC/DC Drivers

AC/DC Controller IC

for non-dimmable LED lighting

BD550FHG

●General Description

LED driver BD550FHG supports both isolated and

non-isolated devices. IC enables simple design of

low-power electrical converters.

With switching MOSFET and current detection resistor

as external devices, it enables more freedom in design.

Since the peak current control is utilized, peak current

is controlled in each cycle, application excels wide

bandwidth and transient response.

BD550FHG includes various protective functions such

as soft start function, burst function, per-cycle over

current limiter, VCC overvoltage protection and

overload protection.

An external latch pin (COMP pin) is provided, so that

latch stopping (OFF) can be set by external signals.

This function is available as overheating protection and

over output voltage protection.

The PWM switching frequency is fixed at 65 kHz.

A frequency hopping function is included which contributes

to low EMI.

●Features

■

PWM frequency of 65kHz

■

PWM current mode method

■

Low circuit current when UVLO is ON

(12

μA at VCC=12V)

■

Low circuit current without load

(Burst operation when load is light)

■

Built-in SW frequency hopping function

■

250nsec leading-edge blanking

■

VCC UVLO / OVP

■

Per-cycle over current protection circuit

■

Soft start

■

Output overload protection (Self-restart protection)

■

External latch function for COMP pin

(Over heating protection function)

●Key Specifications

 Power Supply Voltage range:

8.5V to 25.0V

 Operating Current:

Normal:

0.60mA (Typ)

Burst:

0.40mA (Typ)

 Oscillation Frequency:

65kHz

(Typ)

 Operating Temperature range:

-40°C to +110°C

●Package

W(Typ) x D (Typ) x H (Max)

SSOP6

2.90mm x 2.80mm x1.25mm

●Applications

 Electrical machineries for LED lighting

●Typical Application Circuit

Figure 1,

Application Diagram (Non-Isolated Type)